we'll see whether or not this was indeed a del potro ace. john: all of a sudden del potro is playing fast. he plays slower than anyone on the tour and he's just freaked out right now. dick: three lost opportunities and the last -- in the last game to break federer and now here's federer sitting on another break point. john: that serve was -- if it was in it certainly wasn't in by much. dick: oh, he missed it. john: he's coming unglued. dick: again, the respect that federer earns by his great court defense. trying to get as much as you can on what would have been a makeable shot. john: he's certainly moving well, that's for sure. and he's hitting the ball clean. there's that defense you talked about. he had the ball where he omari hand -- he wanted it, the forehand. he knows that if he gets this i -- this insurance, he'll have a two sets to love lead. dick: grew up idolizing pete sampras, did del potro. admiring safin. out of a town 100 miles out of buenos aires. a town that has produced an important number of tennis important number of tenni

ace. it's 5 you 3. quite a hold on a 0-40. only allergy tine to win the u.s. -- argentine to twin u.s. open was guillermo villas. del potrong to cheer. john: starting to chant "ole." there are a lot of argentines in the crowd. three doubles for him. no aces. there's guillermo villas. hall of famer. won it 32 years ago. so many kids in argentina and in south america, he was their hero. giving them the motivation to play. federer started with a double fault but now has his first ace. john: i was surprised to see del potro move to his left there, give him that angle. john: that's a pretty defensive return. pushed it. roger bounces right back. two more set points. disappointing for del potro not to do a little bit more in this game. dick: and slides the ace wide to secure the set six games to three. it took 40 minutes. watch out, federer wins the opening set, almost impossible to beat him in a major. i have copd which makes it hard to breathe. but now that i'm breathing better with advair... i can enjoy the zoo with my grandkids. (announcer) for people with copd including chronic bronchitis, emphysema, or both, great news. ad

del potro convinced that was an ace. dick: another good serve. john: 125, that forehand.ick: 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 wa

aces to seven tonight. john: another classic federer point. del potro there was in no man's land. left that court open.well to even make federer hit that volley. dick: break point for federer for 4-4. 4-20 in the match. john: it's like 4-3 in the third with a break. dick: an exhausted del potro, battling so hard to come from behind two sets to one. he had the lead but relinquishes. 4-4. mary: this is when federer normally shows his class. djokovic played such a beautiful match against him sunday. it's got to be like when lance armstrong is dominating the tour de france all those years. you feel like you're staying with him until you hit the mountains. all of a sudden this guy has gears you don't have. john: i'm wondering when someone is going to really go at him, really rip one at him to try to push him off that to try to push him off that net. john: that was a frustrated forehand. looked like he was going at federer more but someone's going to take that early drop volley that roger is using quite often now and try to take the guy's head off. mary: that's what you'd like to see? john: i'd like to see s