American teenager Madison Keys overcame a left thigh injury to beat Venus Williams 6-3, 4-6, 6-4 at the Australian Open on Wednesday, ensuring there would be no Williams sisters semifinal.
The 19-year-old Keys will play either Serena Williams or last year’s finalist, Dominika Cibulkova, in Thursday’s semifinal. The Williams sisters last met in a Grand Slam match at Wimbledon in 2009, when Serena won the final.
The semifinalists from the other half of the women’s draw have already been determined No. 2 Maria Sharapova will play No. 10-seeded Ekaterina Makarova on Thursday.
Keys received treatment on her leg after dropping serve in the second set to give Venus Williams a 4-1 lead. After the medical timeout, she came back to break Williams’ serve twice to level the set at 4-all, but Williams then broke her next service game and served out the set, sending it to a decider.
Two men’s quarterfinals were scheduled later Wednesday defending champion Stan Wawrinka against Kei Nishikori, and No. 1 Novak Djokovic against Milos Raonic in a night match.
Andy Murray and Tomas Berdych, who defeated Rafael Nadal for the first time in their 18th meeting, are already through to the semis on the other side of the men’s draw.