serving only 42% first serves in the match. john: five aces, seven double john: five aces, seven double faults. >> out. john: the wind. that's got to be playing some part in that. looked well long. but del potro is challenging. dick: chase review. john: wow. clipped the line. dick: in this break he's hit two lines just on the outside of the line.

they get an extra challenge in the tie-break. federer has two left, del potro four. they start with three per set. john: he's more quickly able to take advantage of a situation, roger. that ball didn't have a lot on it and then he moves right in, takes it early. it's a tall order to pull that shot off from where he was

positioned. dick: he continues to score closing in on the net, federer. >> out. dick: it's enough of a test to face the world's best, but the tie-break brings out another challenge to how well you can face the pressure. face the pressure. >> let. dick: del potro holds his two

points. 3-2 against a man who has had a brilliant record in the grand slam event finals. federer is 18-3 in tie breaks in the championship final of a major. 4-0 here at the open. dick: he gave federer the best he had with that forehand, but the maestro sends it right back. john: you're absolute right. you can't possibly hit a

forehand harder than he hit earlier in that rally and he still lost the point. mary: he plays from so far behind the baseline too compared to federer. so often he's in this kind of position trying to hang in these long rallies. in the middle of that rally, this guy hit a 108-mile-an-hour forehand and federer snapped it back and ended up winning the rally. dick: they change ends, 3-3. would you rather be at the end where federer is now or del potro? john: del potro. a little wind behind him. and he's hitting the ball better than at any point in this match. dick: has the first mini break. it goes to del potro. four points to three for the 20-year-old.

john: that's in. the crowd realizing that this is about to become a real test for federer now. del potro says let me win won. you have the record, 15-0 already. dick: playing with tremendous confidence now, del potro. going for his shots. three set points. john: that serve the biggest of the day.

138. dick: this is where federer so often, as his father watches and wife mirka calls up "the right stuff," facing three set points. mary: oh, he missed it. kind of like the volley andy roddick missed at wimbledon. had a set point, his fourth. john: this is the first one and he's going to have a serve even

if he were to lose this point. he's for the first time pushing roger around the court. dick: that's long. so del potro is going to have to do it on his serve. here it is, the third set point. point. 6-5. dick: he's got the set!

john: we've got a match. dick: seven points to five, del potro. levels the match. i've been growing algae for 35 years. most people try to get rid of algae, and we're trying to grow it. the algae are very beautiful. they come in blue or red, golden, green. algae could be converted into biofuels... that we could someday run our cars on. in using algae to form biofuels, we're not competing with the food supply. and they absorb co2, so they help solve the greenhouse problem, as well. we're making a big commitment to finding out... just how much algae can help to meet... the fuel demands of the world.

just how much algae can help to meet... boon motorcycle insurance, rv,at geiccamper, boat insurance. nice work, everyone. exec: well, it's easy for him. he's a cute little lizard. gecko: ah, gecko, actually - exec: with all due respect, if i was tiny and green and had a british accent i'd have more folks paying attention to me too...

i mean - (faux english accent) "save money! pip pip cheerio!" exec 2: british? i thought you were australian. gecko: well, it's funny you should ask. 'cause actually, i'm from - anncr: geico. fifteen minutes could save you fifteen percent or more on car insurance. [the captioning on this program is provided as an independent service of the national captioning institute, inc., which is solely responsible for the accurate and complete transcription of program content. cbs, its parent and affiliated companies, and their respective agents and divisions are not responsible for the accuracy or completeness of any transcription or for any errors in transcription.] [captioning made possible by cbs sports, a division of cbs broadcasting, cbs sports, a division of cbs broadcasting, inc.] mary: federer's serve is still betraying him that. second set of his, he served it 44%. had 18 unforced errors and 11 winners and still went to a tie-break.

dick: his record in major finals in tie breaks, 18--0 until that last tiebreaker. john: i think this is such a key moment, these first few games in this set for del potro. try to maintain that intensity. and roger, give in just a tiny bit, the satisfaction of what he's accomplished and let down at all. dick: that one call that was overturned along the sidelines seemed to stay with him much longer than a normal federer longer than a normal federer demeanor.

john: he's definitely going to take it to del potro here early to test him. mary: that was a series of amazing forehands from juan martin del potro. one of them federer still convinced missed wide. they called it good and this one was a clean one. he did it in the tie-break as well. his big guns started firing with great success and here was set point for del potro and again he ends it with his forehand side. dick: that's the shot making that has delivered him a couple of more titles this year. 48-11 record. he won in auckland and washington, d.c., both hard court wins.

dick: and last summer, remember, he had that tremendous win streak. 23-mat streak coming into the u.s. open. he had a hot summer. >> let. dick: that forehand now, he's striking it with full confidence. john: yeah, he's found his range and he's really taking it to federer. mary: one of the reasons is he's moving better. john: absolutely true. giving himself a little bit more time to set up and go after his best shot. john: it's amazing what that shot of adrenaline does.

mary: his nerves have burned off. someone in the stands gets to keep that one. dick: nice ricochet and here at the u.s. open you can keep that as a souvenir, although the gentleman who came up with the ball, hands it to a young girl. nice touch. now the man that caught it was three or four rose in front. so we open this third set and both men hold their games at love. not only are these two battling for the $1.6 million that go with first prize but the winner also receives the new lexus

hardtop convertible. hardtop convertible. >> out. dick: federer's challenged the call. he thought he had an ace. chase review -- yep. so after scoring only five aces in two sets he has three already in two service games of this third set. john: i can't imagine that percentage will remain at the level we've seen in the first two sets. >> out.

dick: you get at five-set final when you're at the united states open. it's quite a rarity. you go back through all the years to 1980, there have only been three five-setters to decide the championship. all the way back to 1980 when mcenroe and borg. 1988, wilander-lendl and 1999 agassi and martin. will we get one today? john: a little too close because he's noticed that del potro is moving better. clearly has an incredible

opportunity here with this momentum. he looked out of it. mary: again that movement very, very impressive. john: remember, he could have been two breaks down in the been two breaks down in the second. dick: so here he is with two opportunities to grab the lead in the third. >> out. dick: tried to draw that one outside in. miss wide. john: he tried to use the wind but it didn't give him what he expected there. it was a big chance.

dick: one break point now, at deuce. >> out. dick: there's the opening. dick: two hours of action, a set all. [ thunder rumbles ] what is the sign of a good decision? in the world of personal finance, it's massmutual. find strength and stability

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the first-ever hs hybrid. only from lexus. dick: back live at the usta billie jean king national tennis center. bruce willis. many of the stars out yesterday and today to see the top players in this sport. tony bennett, a regular here at the open. gwen stefani. mary: her husband gavin, very close friend of roger's. dick: 1-2.

mathieu broderick. mary: in the president's box. john: that's what he's got to be careful with because if he doesn't get the angle he wants he'll leave that side of the court open. john: the singer of "bush" and the singer of "no doubt" and they have a couple of kids. like agassi and instead of gli he loves tennis so much he'd probably before the -- prefer

the kids to be tennis players. mary: i'm anticipating not seeing a lot of trick shots from federer anytime soon. this is all business now. this 20-year-old is growing up in a hurry on this court, his first major final. dick: playing with real conviction. didn't have that earlier. john: and this is where the fact that he is 6'6", imposing himself on federer is going to pay off. normally when a match went late into a third or fourth set it would be a problem for him but these conditions are good. the sun's down. it's not real hot. >> out. john: i would think it would be an edge for him. but roger at 28, a to the -- lot of tennis behind him already this year. a tougher time bouncing back

two days in a row. dick: after scandal tears her wife apart, how will "the good wife" put it back together? premiering tuesday, september 22, only cbs. a set all, 2-2. john: and for him he's a little flat, roger. this is where del potro has to really step it up. he's got an amazing opportunity here. mary: right now he's actually moving better than roger federer. dick: there's really a freedom to his game suddenly. he believes this could be his day. john: he didn't believe it about 25, 30 minutes ago.

dick: he was down a set and down a break serving at 1-3 and saved two break points when it looked like roger would just roller coaster right out of here with another u.s. open championship. >> out. dick: then federer at 5-4, 30-0. suddenly a couple of key points, including a critical call on the sideline, del potro able to break him. won the breaker seven points to five. a flush of forehands doing the job.

dick: his service game picking up, federer. by 2010, 30%... of the data stored on the world's computers will be medical images. the trouble is all of that information is trapped. x-rays aren't talking to...

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such an iconic event. dick: a set all. del potro onerve. juan martin del potro in the middle of the championship. he said maybe i have the game but i need the experience, and then after beating nadal said, i think this is the best moment of my life. it's something even higher emotionally for that in store for him. roger asking the chair umpire -- he's challenged now. he said it seemed really close. chase review. really close. john: i think he's learned from that experience at the french what it's going to take to beat a federer. he's certainly stepped it up a

gear. if he's got an extra one, del potro might be able to win his first slam. he prefers this hard court. mary: federer is not as his best. that's what we were saying in the beginning. you have to be prepared to play your best, be prepared that it's not enough against federer, then you have to keep going anyway, hoping he's not at his best. he's not. dick: del potro now in three service games of this third set has surrendered a single point, just one point to federer. dick: goodness. 3-3. saturday the home depot s.e.c.

on cbs returns. the vols' new coach and the defending national champion florida gators. college football today right here on cbs. john: as you would suspect his first-serve percentage is starting to go off. he's taken a little bit off it, which is a proper play. mary: he's probably passed 60% for a set. dick: a couple of first serves in this this game and a 30-0 lead. his serve was challenged at 1-1

in this set. faced a break point. del potro just miss add forehand wide. john: you can see how his ball on both sides really jumps off the court. it's about as quick a court as they play on on the tour. mary: del potro seems to be making the adjustment knowing that roger is taking something off his serves. he's going after them. dick: another mis-hit from federer. there have been a rash of those. john: he got too far back

around the baseline. it was del potro that was hugging that area of the court. the bigger problem is that del potro is serving bigger now. dick: key point here in the middle of the third set. 3-3, 30-30. dick: that's wide, and a break point to del potro.

dick: juan martin del potro in the lead. a set all, he's up a break.

dick: getting more and more serious for the five-time defending champion. he's never lost to del potro. he trails now in the third set.

and del potro trying to consolidate that break. since that critical call on the sideline late in the second set, del potro building momentum. >> out. john: he does not want to get careless. that was a pretty easy forehand that he caught a little late. dick: only the second point he's lost on his serve in this entire set. 22-25 going back to the tie-break. wind-blown paper.

beautiful change of speeds for federer. set up that 0-30. mary: you can hear the squeakiness of his footwork in this one. i think he's come to know he's gotten a little bit soft in that department. got himself there in time to really line up that shot. dick: the countrymen of del potro, we mentioned it yesterday, said you can beat federer. all tough do is hit it to his backhand. john: the last guy that beat federer here six years ago. dick: moves to 0-40 to break

back. he's made that backhand a strength in the last six years. john: this would be a major bummer for del potro to get the break finally and dump his serve the next game. all the moment you will. john: the wind kicked in making it difficult for both guys to hit it clean. dick: federer has lost only four times in 55 matches at the u.s. open. the last in the fourth round of 2003 and since then, federer unbeaten. 40 in a row. mary: he was the first player

in men's tennis to win at least 40 matches in two different grand slam tournaments, this one and wimbledon. dick: 40 consecutive. john: that wind is really swirling out there right now. critical time in this third set. dick: federer played a lot of defense on that point by del potro prevails. longest rally of the match, 17 hits. another break point for federer. 2-15 in the match today after converting almost 50% in the

first six matches of the championship. dick: he breaks back. john: right here you thought it was over. he had a pretty good look at that ball and missed it well long. dick: let's see how that effort by federer to get back to 4-4 impacts the action here late in this third set. del potro unhappy with himself. and the fact that he had that net court which set up the charge to the net by federer.

del potro convinced that was an ace. dick: another good serve.

john: 125, that forehand. dick: rocket! john: and he's against the wind. mary: 108. dick: from outside the court, able to bludgeon another forehand. john: look where he is when he hits this ball. flat and right inside the baseline. incredible. he's got a chance to break

right back. >> out! dick: he had a good look at it. didn't like what he saw. john: he caught it a little late and then the wind pushed it. obviously knows he should have played it in a different area. and all of a sudden federer has a point to hold. really put the pressure on del potro. >> out. dick: that's been a popular spot for him in the ad court. just missed. >> out. dick: called wide. no challenge.

let's see. del potro considering a challenge. it's too late now. shouldn't be allowed that much time. >> the ball was called out. >> he was talking to you? >> i wasn't allowed to challenge after two seconds. the guy takes like 10 every time. dick: the chase review showing it was out. >> you have any rules? don't tell me to be quiet, ok? when i want to talk i'll talk, all right. i'm here on this tiny little plane, and guess what...

i've still got room for the internet. with my new netbook from at&t. with its built-in 3g network, it's fast and small, so it goes places other laptops can't. anything before takeoff mr. kurtis? prime rib, medium rare. i'm bill kurtis, and i've got plenty of room for the internet. and the nation's fastest 3g network. (announcer) sign up today and get a netbook for $199.99 after mail-in rebate. with built-in access to the nation's fastest 3g network. only from at&t. dick: now roger federer continued to battle with the chair umpire verbally over the fact that conor allowed del potro way too much time to challenge on that last call. john: it was certainly very uncharacteristic of roger. the moment got to him but he is

absolutely right, that way too much time had gone by and they've got to do something about that rule. these guys talk to their coaches. they might as well call up here and ask what we think. mary: you know what i feel about this whole challenge system. it's so flawed. but he cursed at the chair umpire a couple of times in this last changeover. dick: it wasn't venomous, however. mary: it was cursing, what do you mean? john: what set him off is the umpire telling him to be quiet, which is absurd to say that to federer. mary: roger had an answer for mary: roger had an answer for that. dick: the wind playing havoc with that entire point, and del potro dumps it in the net. john: which is all the more reason why youave to keep up your focus and intensity. it's footwork too.

and hope that isn't the different -- difference in the set right there. dick: a champion's kiss. 0-30. john: he looked like he was going to hit it big and then he sliced it. total surprise move. this is just outright luck. dick: del potro with that bad luck finds himself in a 0-30 hole. federer two points from a two

sets to one lead. dick: another big forehand. john: he found the range of that. he sets himself up with some spin and then when he's got the look he wants he just flattens it out. you see there. gets it set up and it's goodbye. dick: people joining us at the start of the match, first hour say, how can he be number six in the world, now number five? now, the last hour, you know why. what a weapon he has with that forehand.

john: he's got a lot more than that at only 20 years old. dick: a lot of upside, isn't there? john: there sure is. john: still a tricky spot here. second serve, 30-30, 4-5. dick: you saw it coming, didn't you? john: federer's got set point. dick: a double fault sets upset point for federer. 17th break point of the match. for the swiss maestro.

dick: oh, it falls his way. federer leads. we need a new grid. more than half the energy never reaches a single light bulb. is that true? it's true. we need a smarter grid... smarter thermostats... smarter utility meters... smarter houses... [doorbell rings] smarter cities... smarter infrastructure... smarter networks. connect them all together... and what do you got? smarter energy grid. smarter planet... wasting less energy. that's what i'm working on. i'm an ibmer. let's build... let's build a... smarter planet.

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is so important; it's dedicated to producing ten thousand new math and science teachers, so we can inspire today's tinkerers to become tomorrow's much-needed innovators. dick: del potro had not double faulted the entire set and then two in a row at 30-30 and 30-40 to give federer a two sets to one lead. mary: he spent the whole changeover with his head in his hands. john: that's not surprising given the fact that he'd worked his way into a winning position, a break up in the third, 4-3. just to let it slip away on two double faults. that's not easy to overcome. mary: now he's talking to his coaches. that's what aggravated roger, that he consulted his coaches about the challenge so late.

switching sides, almost. john: well, he's not the first guy. mary: everybody -- the challenge, everyone cheats. john: it's a joke. mary: that's what i've been saying. it's a joke. everyone cheats. it's illegal coaching. john: if it's the umpire -- isn't it umpire's thing to do something about it? mary: have you ever seen it? john: i'm just saying. mary: they're cheeth. dick: 1,oo 2, 1,003, the moment is gone.

mary: that is illegal to consult your coach. what else can you call that? it's in the rule book. dick: that one doesn't go over, 30-30. john: i'm calling how did you see it? did you see it in or out? i'll tell you one thing that will help him. somehow he gets off early here. this could get away from him quick. dick: federer with a little extra jice on that shot that -- juice on that shot that del potro tried to volley. john: that was a great approach shot by del potro. roger did real well with that forehand. mary: who among these two is moving better, winning the big points? taking the sets? it's his 10th ace.

dick: bill tilden won six in a row, 1920 through 1925. on this exact day 80 years ago, september 14, after his six-win streak, he didn't win a couple of years and then in 1929 won his seventh u.s. title, beat francis hunter 6-4 in the fifth. no one else in more than 100 years of the united states championship, other than tilden and federer, have won five and federer, have won five straight.

john: obviously he's quite deflate. his legs suddenly get heavier. he's fighting it big time right now. he better get it together if he wants to extend this to a fifth set and try to win this thing. dick: it's wide. it just did -- mary: wonder when del potro starts using the net more --

how much tougher he'll be to beat. john: that's not a good call by del potro there, throwing in another drop shot. dick: federer has gone through the test of the emotional energy that is consumed in these championships, especially playing five-setters back-to-back as they have. del potro-nadal yesterday. federer today. he misses wide, so here's two break points for federer.

john: remember a set and a break -- almost a double break down and 4-3 serving for it. the momentum swing that has just taken place, these almost feel like match points right now. dick: that is two saved breakers. back to deuce. john: some positive energy. two good serves and forehands to get him back to deuce. this is about to end.

i think he's got enough left physically and he's hitting the ball well. mary: after those two double faults cost him that last game he's making sure with these, isn't he? here's a chance for roger. oh, that's way off. >> out. dick: wide, and game point, del potro. john: the first toss was way too far in front of him and it's unusual to see del potro hit a first serve 102 miles per hour. he's definitely edgy.

dick: another 100-mile-per-hour-plus forehand. john: the way he spanks the ball and the sound that comes off his racket cranks up the crowd. got him going. that was a huge game for del potro. dick: dig out of two break points. cbs swing vision showing that high follow-through straight around the body, flat. john: you can generate more pace but more spin if you go through it the way del potro has as opposed to nadal. that's why he has more problems with nadal on this court.

the kick he gets on his spin ask not going to hurt a del potro as much or jump up as high as it would on a slower hard court or a clay course. mary: it makes sense that at 6'6" del potro has been able to beat nadal three times this year. although nadal's balls ride up high, can handle it. hit his own forehand.