MELBOURNE, Australia >> American teenager Madison Keys advanced to the Australian Open semifinals after overcoming a left thigh injury to beat Venus Williams 6-3, 4-6, 6-4 on Wednesday.

Keys received treatment on her leg after dropping serve in the second set to give Williams a 4-1 lead. After the medical timeout, the 19-year-old 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.

The match featured 12 service breaks, seven won by Keys, and 83 combined unforced errors. Williams had only 10 winners to go with her 38 unforced errors; Keys had 34 winners and 45 unforced errors.

Keys will play either Serena Williams or last year’s finalist, Dominika Cibulkova, in Thursday’s semifinal.