Top seed Maria Sharapova continued her march through the WTA Tour event on Thursday, reaching the semi-finals with a straight-sets victory over Elena Baltacha.

Sharapova, ranked 16th in the world, defeated her British opponent 6-2, 7-5. She hasn’t dropped a set and has lost only 11 games in three matches in her first tournament since falling in the first round of the Australian Open last month.

Sharapova next faces fifth-seeded Czech Petra Kvitova, who rallied to beat third-seeded Estonian Kaia Kanepi 1-6, 6-3, 7-6 (7/0).

In men’s action, top seeded American Andy Roddick booked a quarter-final berth with a 7-6 (7/2), 6-4 victory over Lu Yen-Hsun of Taiwan.

Roddick, pushed to three sets in a first-round win over compatriot James Blake, is the defending champion and reached the quarter-finals for the ninth straight year.

Roddick fired 10 aces against Lu, ranked 114th in the world.

Fifth-seeded Czech Tomas Berdych and eighth-seeded Sam Querrey of the United States also reached the quarter-finals.