2009-03-31 03:53:03 -

KEY BISCAYNE, Florida (AP) - Results Monday from the Sony Ericsson Open, a $4.5 million ATP Tour and $4.5 million WTA Tour event on hardcourts at the Tennis Center at Crandon Park (seedings in parentheses): Singles
Men
Third Round
Juan Martin del Potro (6), Argentina, def. Janko Tipsarevic, Serbia, 6-4, 6-1.
Viktor Troicki, Serbia, def. Bjorn Phau, Germany, 6-4, 6-3.
Rafael Nadal (1), Spain, def. Frederico Gil, Portugal, 7-5, 6-3.
Andy Murray (4), Britain, def. Nicolas Massu, Chile, 6-4, 6-4.
David Ferrer (11), Spain, def. Marin Cilic (17), Croatia, 3-6, 6-3, 6-4.
Stanislas Wawrinka (16), Switzerland, def. Igor Andreev (20), Russia, 4-6, 6-3, 6-3.
Women
Fourth Round
Caroline Wozniacki (13), Denmark, def. Elena Dementieva (4), Russia, 7-5, 6-4.
Svetlana Kuznetsova (8), Russia, def. Alisa Kleybanova (24), Russia, 6-2, 6-1.
Victoria Azarenka (11), Belarus, def. Agnes Szavay (25), Hungary, 6-2, 6-4.
Venus Williams (5), United States, def. Agnieszka Radwanska (10), Poland, 4-6, 6-1, 6-4.
Samantha Stosur, Australia, def. Amelie Mauresmo (20), France, 6-4, 6-4.
Iveta Benesova (26), Czech Republic, def. Anabel Medina Garrigues (19), Spain, 6-4, 6-1.
Serena Williams (1), United States, def. Zheng Jie (17), China, 7-5, 5-7, 6-3.
Doubles
Men
Second Round

Julien Benneteau and Jo-Wilfried Tsonga, France, def. Rik de Voest, South Africa, and Bobby Reynolds, United States, 7-6 (4), 6-4.
Bob and Mike Bryan (1), United States, def. Ivo Karlovic, Croatia, and Dusan Vemic, Serbia, 4-6, 7-6 (5), 10-8 tiebreak.
Julian Knowle and Jurgen Melzer, Austria, def. Nicolas Almagro and David Ferrer, Spain, 6-0, 7-6 (7).
Bruno Soares, Brazil, and Kevin Ullyett (6), Zimbabwe, def. Marc Lopez and Rafael Nadal, Spain, 6-3, 6-4.
Women
Second Round
Anna-Lena Groenefeld, Germany, and Patty Schnyder, Switzerland, def. Petra Martic, Croatia, and CoCo Vandeweghe, United States, 6-1, 6-2.
Svetlana Kuznetsova, Russia, and Amelie Mauresmo, France, def. Cara Black, Zimbabwe, and Liezel Huber (1), United States, 6-4, 4-6, 10-4 tiebreak.
Samantha Stosur and Rennae Stubbs (4), Australia, def. Anastasia Pavlyuchenkova and Elena Vesnina, Russia, 6-3, 7-6 (4).
Chuang Chia-jung, Taiwan, and Sania Mirza, India, def. Maria Kirilenko, Russia, and Flavia Pennetta (8), Italy, 4-6, 7-6 (5), 10-4 tiebreak.