hello, i'm mark edwards, and this is sport today, live from the bbc sport centre. coming up on this programme. manchester united march into the quarter finals of the fa cup. they put chelsea to the sword at stamford bridge we find out the latest from lausanne as olympic 800m champion caster semenya's appeal against an iaaf rule begins. caroline wozniacki struck down by the dreaded lurgy. it's a viral infection that forces her to pull out of the dubai open. hello, thanks for joining hello, thanks forjoining us. we start with football, and manchester united are through to the quarterfinals of the fa cup in england. ander herrera and paul pogba scored the goals as they beat the holders chelsea 2—0 in their fifth round tie at stamford bridge. our sports gorrespondent katie gornall reports. even with that experience, fans

arriving here at stamford bridge did not know what to expect. while they stuttered, the united caretaker manager has been flawless. sergio romero was kept on his toes. united fans breathed a sigh of relief, and soon that sign would turn into a roar. paul pogba with the perfect ball, and herrera with perfect timing. but chelsea's manager, the pressure was mounting and it would get worse. no player sums up the united revival more than paul pogba, who scored eight stores since celtic charge, make that nine. paul pogba at his absolute best again, he is driving manchester united! 2-0 at half-time, and united we re united! 2-0 at half-time, and united were flying. it would take something special for chelsea to bring them back down to earth, but this was as

good as it got. chelsea and their fa ns good as it got. chelsea and their fans can't cope with much more of this. at the final whistle, the booze at one end were mirrored by cheers at the other. as one manager lives to be —— looks to be living on borrowed time, the other could be here to stay. that performance was fantastic. the tactics worked, and we put our infielders near paul to get higher to get them the box more often. so it worked, but the defending second half when we had to was fantastic. chris being out for two months, just playing the game. obviously we've had some criticism after the game against psg, we didn't create a lot. tonight was a tough game, and have to say, everyone down to a tee, they did absolutely what we asked them. and manchester united will be away

to wolves in the quarterfinals. here's the draw in full. the ties will be played between 15th and 18th march. in germany, borussia dortmund missed the chance to open up a five—point lead at the top of the bundlesliga. they were held to a goalless draw by bottom of the league nuremburg, who had goalkeeper christian mathenia to thank for keeping dortmund kept at bay with a string of fine saves. the result means dortmund move three points ahead of bayern munich at the top. they did have the ball in the back of the net near the end, but jakob larsen‘s effort was correctly ruled out for off—side. in italy, roma beat bologna to move to within a point of the top four. aleksandar kolarov and federico fazio scored their goals in a 2—1 victory at the stadio olimpico. bologna remain in the bottom three. in portugal, benfica won 3—0 at aves to move to within a point of the leaders porto. swiss striker haris seferovic opened the scoring after only three minutes.

and rafa silva made it 2—0 with this neat turn and finish ten minutes before the break. ferro added the third in the second half, but five minutes later, he was sent off for this challenge on derley. 3—0 the final score. olympic 800m champion caster semenya's appeal against a regulation, restricting testosterone levels in female runners began on monday. the iaaf, is attempting to limit the levels of testosterone in her body, which they claim gives her an unfair advantage. semenya is seeking to overturn the rule at the court of arbitration for sport. if she loses, it will have a huge impact notjust on her career, but the sport as a whole. reports from lausanne. you have to walk before you can run.

she is challenging new regulations that will require female athletes with naturally high testosterone levels to take medication to lower the hormone prior to competing. her lawyers claim that is discriminatory. obviously the evidence will be very aided at the end of this week. so today is the start. they argue that hyper androgynous, a condition characterised by a higher value of male sex hormones, naturally. but they fear that if left unchecked, women athletes with naturally elevated testosterone will dominate athletics. the regulations that we are introducing are there to protect the sanctity of fair and open competition. they introduced its first hyper androgynous and regulations in 2011, but in 2015 the rules were suspended when an indian sprinter successfully challenged

them. now armed with new research into the effects of testosterone, the i-aa f into the effects of testosterone, the i—aa f say the medication to lower hormone levels are the only way to lower —— level the playing field. several sports bodies are watching this case with great interest. that's because they also are trying to determine how they would classify athletes with differences in sexual development. it is an issue that goes to the heart of gender and identity in elite sport. the un has stepped in to make a statement that they are very concerned that these types of regulation violate bodily autonomy and dignity, and foster discrimination against women. judgement in this case is expected by late march, and the outcome will have far—reaching implications that potentially go beyond her competitive future. richard conway, bbc news. onto tennis, and world number one naomi osaka says she split

from her coach sascha bayin because she wasn't willing to "sacrifice" her happiness. a surprising move, perhaps. osaka has won herfirst two grand slam titles, the us open back in september, and the australian open just last month while working with bayin. i know everyone think it was a money related issue, but it wasn't. for me thatis related issue, but it wasn't. for me that is one of the most hurtful things i've ever heard, because i travel with everyone on my team. i see them more than my family, so i think my reason is that i wouldn't put success over my happiness. i won't say anything bad about them because of course i'm really grateful for the things i've done, and i'll miss some of the things that he does. but for me, all the people that i have right now are all willing to do the things that he does, so i don't think it will be that much of a big deal. naomi osaka is among the big—name players taking part in this week's dubai championships, one of the "premier five"

events on the wta tour. but a notable absentee will be caroline woziacki. she was forced to pull out with a viral infection on the eve of her first round match. it's the same illness that forced wozniacki to to miss last week's qatar open in doha. these two weeks are the two weeks i usually play well in. two hard—core tournaments affected my game well, so tournaments affected my game well, so it sucks, you know? i was hoping that maybe taking a little bit of time to myself to try to recover, i was hoping i would be ready to play today. but i just was hoping i would be ready to play today. but ijust wasn't. among those in action on monday was elise mertens, but two days after winning the qatar open, the belgian fell at the first hurdle in dubai. she was beaten in three sets by the chinese qualifier zhu lin in a match that featured 17 breaks of serve. zhu plays the ukraine's lesia tsurenko in round two. boxing now, and the proposed heavyweight rematch

between the the reigning wbc champion deontay wilder and the former champion tyson fury is now in doubt. that's because fury has signed a new deal, said to be worth more than $100 million for his fights to be shown on espn in the usa. wilder has an exclusive deal with rival company showtime. the briton‘s team say an announcement on his next fight will be made in due course. i've already beat wilder in his own country. if it happens, happens. if it doesn't, it doesn't. it's nothing of the world, it's only a boxing fight. i've artie been him in america. let's make it happen. we are better than the biggest tv station in the world. i had a great year last year, best year of my life. the big comeback story, epic icing on the case. it would be very harmful —— hard arrival last year. i don't think i'll ever reach that again in my lifetime's or anyone else's. you can get all the latest sports news at our website,

that's bbc.com/sport. but from me and the rest of the sport today team, goodbye. hello there. there is a trend for our weather to turn very mild for the end of the week, the big picture, we are seeing southerly winds developing for the next few days, jacking up the word air 2000 miles to our south pushing towards the uk. there is a question about how much cloud there is going to be. certainly looking cloudy for the next few days. that is where we will most likely see cloud break. cloud break towards the end of the week, or we could see temperatures as high as 17—18 celsius for a few of us. some warm weather for late

february on the way. back to today's weather, we have a relatively clear skies across england and wales. for the most of us, a few showers on the western areas. lighter winds across the south, but those clear skies, we also have some patches of frost in the countryside. even 1—2 fog patches for tuesday morning. but the early risers, there will be chilly weather out there. some sunshine. showers across the northwest will tend do ease as cloud beds and later in the day, and we will see some wet weather pitching in the northern island. it should stay largely dry and bright. and also across the northeast of scotland with temperatures into double figures, it will be a mild day. big tuesday night. the rain will push its way northwards and eastwards, it is going to be a modern night

but if it is around 7—10 celsius. it rained quite persistent and heavy times in the northwest. i will take you onto wednesday two we have a low pressure, could be from the south westerly direction, but we will have rain at times. the wettest of the weather, on the western part of the country. as the rain tries to move eastwards, it will begin with high pressure. that will not be much rain in the forecast for this week is england, that is where we will have the best of brightness around. there are signs that thursday should start to brighten up but the best of sunshine most likely today ground. the midlands, eastern areas of england and not doing too bad. in the northwest, but still quite a bit of cloud, a threat of rain in the north. those temperatures are beginning to rise. friday, with a bit might sunshine around, but it is that we are going to see temperatures as high as 18 degrees. that is our weather.

welcome to bbc news, broadcasting to viewers in north america and around the globe. my name is mike embley. our top stories: the founder of huawei hits back. in an exclusive interview, ren zhengfei says american actions against his company and his daughter are politically—motivated. translation: that there is no way the us can crush us. the us can shine and if the north goes dark, there is still the south. —— the east can shine. president trump steps up the pressure on venezuela's leader nicolas maduro. he stresses again, all options are on the table. shamima begum tells the bbc it was her choice to join the islamic state group as she asks the uk for forgiveness. in a medicalfirst, a british woman gets dna treatment to halt the most common form of blindness in the uk.