The top seeds struggled on Wednesday at the WTA Mutua Madrid Open with Maria Sharapova, Vera Zvonareva and Jelena Jankovic all departing.

Maria Sharapova and Vera Zvonareva are both through to the third round of the WTA Mutua Madrid Open after winning their second round ties on Monday.

Victoria Azarenka has retired from her third round match of the WTA Porsche Tennis Grand Prix due to a shoulder injury.

Maria Sharapova is into the final of the Sony Ericsson Open in Miami after producing a powerful display of tennis to beat Andrea Petkovic 3-6 6-0 6-2.

Victoria Azarenka of Belarus produced some outstanding tennis to beat world number two Kim Clijsters in the quarter-finals of the Sony Ericsson Open in Miami.

World number one Caroline Wozniacki is out of the Sony Ericsson Open in Miami after suffering a fourth round defeat at the hands of Andrea Petkovic of Germany.

Third seed and recent Doha champion was a big name casualty at the BNP Paribas Open on Sunday, crashing out of the tournament in the third round after a marathon three-hour struggle with Dominika Cibulkova.

Kim Clijsters and Jelena Jankovic both made short work of their opponents in the heat of the desert at Indian Wells.

Current Wimbledon Champion Serena Williams has told NBC she is hoping to make a return to the sport "early summer" after recoving from a blood clot on the lung.

Defending champion Kim Clijsters thrashed Vera Zvonareva 6-2 6-1 in Saturday's US Open women's final.