BIRMINGHAM, England—Maria Sharapova reached her first semifinal in more than a year by defeating Yanina Wickmayer, 6-1, 2-6, 6-3, Friday at the Aegon Classic.

The former top-ranked player struggled with her serve in the second set, but regained her stride in the third to break her 19-year-old opponent twice for a 5-1 lead.

Sharapova had 11 double-faults with a remodeled serve to protect her shoulder, which required surgery last year and sidelined her for 10 months. Sharapova next plays Li Na, the former Wimbledon quarterfinalist from China who beat Stefanie Voegele, 6-3, 7-6 (3).

In London, Andy Roddick stayed on track for his fifth title at Queen’s Club by defeating Ivo Karlovic, 7-6 (4), 7-6 (5), Friday, advancing to the semifinals of the Aegon Championships, where he’ll face fellow American James Blake.