LIVE TEXT COMMENTARY (all times BST)
606: DEBATE
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By Piers Newbery
1717: Nadal opens with a great drop shot but Del Potro recovers to hold for 1-0. Meanwhile, Britain’s Heather Watson is 1-0 up against Yana Buchina in the girls’ final.
1715: Back to the present and, as you all know, it’s Nadal v Del Potro up first and not Federer v Djokovic as I said at the start. My brain hurts. The players are knocking up on a sun-drenched Arthur Ashe Stadium.
Anne Keothavong on Twitter:](http://twitter.com/annekeothavong)“Clijsters in final… wow. Serena going nuts… wow. Womens tennis=drama.”
5 live’s David Law tweeting from Flushing Meadows:](http://twitter.com/DavidLawTennis)"The media bus is abuzz with talk of last night. The bus driver waded in saying that, regardless of frustration, Serena showed ‘no class’."1709: Try as I might, it’s hard to concentrate on the men’s semis just now as everyone is still talking aboutSerena’s outburst last night.Jeff Tarango on 5 live sports extra was not impressed with her behaviour but suggests officials should not be calling foot faults on such important points. Any thoughts on that Thought so.
5 live’s Steve Rudge tweeting from Flushing Meadows:](http://twitter.com/5livetennis)"Lots of live comm today. 5live Sports Extra @ 5pm for Nadal v DelP. 5live @ 9pm for Fed v Djok. 5live @ 2am for Clijsters v Wozniacki!"1700: Good afternoon, and welcome to the wacky world of the US Open. I have very little idea what time or even day it is, but I do know we’ve still got a tournament to finish. First up today is Rafael Nadal against Juan Martin del Potro, before Roger Federer plays Novak Djokovic in the men’s semi-finals.