US Open 2017: Stephens v Sevastova, Venus Williams v Kvitova and more – live!

Rolling updates from the quarter-final action at Flushing MeadowDel Potro beats fever and Thiem in thriller to set up Federer matchEmail nick.ames.casual@theguardian.com | Tweet @NickAmes829.05pm BSTSevastova is still struggling and quite clearly trying to keep the points short – plenty of drop shots and big hits. But Stephens’ game has fallen apart rather in this set so far, much like Dominic Thiem’s yesterday. Another Sevastova drop shot brings up advantage and another break