James Waterson reports on day 11 of the US Open. Rafael Nadal came back from a 3-0 deficit to beat Gilles Muller 7-6, 6-1, 6-2, and Andy Roddick defeated David Ferrer 6-3, 6-4, 3-6, 6-3 on Court 13. Andy Murray ended Donald Young's run at the US Open, beating him 6-2, 6-3, 6-3, and he'll play John Isner, who ousted Gilles Simon in four sets. On the women's side, Serena Williams won her quarterfinal match against Anasatasia Pavlyuchenkova, and she'll play Caroline Wozniacki for a spot in the final. Germany's Angelique Kerber reached her first Grand Slam semifinal when she upset Flavia Pennetta in three sets, and she'll play Samantha Stosur, today's winner against Vera Zvonareva.