MELBOURNE, Australia — Results Sunday from the $15.44 million Australian Open at Melbourne Park (seedings in parentheses):

Singles

Men

Fourth Round

Juan Martin del Potro (8), Argentina, def. Marin Cilic (19), Croatia, 5-7, 6-4, 6-4, 6-2.

Andy Roddick (7), United States, def. Tommy Robredo (21), Spain, 7-5, 6-1, 6-3.

Roger Federer (2), Switzerland, def. Tomas Berdych (20), Czech Republic, 4-6, 6-7 (4), 6-4, 6-4, 6-2.

Novak Djokovic (3), Serbia, def. Marcos Baghdatis, Cyprus, 6-1, 7-6 (1), 6-7 (5), 6-2.

Women

Fourth Round

Marion Bartoli (16), France, def. Jelena Jankovic (1), Serbia, 6-1, 6-4.

Dinara Safina (3), Russia, def. Alize Cornet (15), France, 6-2, 2-6, 7-5.

Vera Zvonareva (7), Russia, def. Nadia Petrova (10), Russia, 7-5, 6-4.

Jelena Dokic, Australia, def. Alisa Kleybanova (29), Russia, 7-5, 5-7, 8-6.

Doubles

Men

Third Round

Mariusz Fyrstenberg and Marcin Matkowski (6), Poland, def. Andrei Pavel and Horia Tecau, Romania, 6-2, 6-2.

Mardy Fish and John Isner, United States, def. Bruno Soares, Brazil, and Kevin Ullyett (7), Zimbabwe, 6-2, 7-6 (7).

Feliciano Lopez and Fernando Verdasco, Spain, def. Lucas Arnold Ker and Juan Monaco, Argentina, 6-2, 7-5.

Bob and Mike Bryan (2), United States, def. Rajeev Ram and Bobby Reynolds, United States, 6-3, 6-7 (5), 6-3.

Women

Third Round

Hsieh Su-wei, Taiwan, and Peng Shuai (16), China, def. Anabel Medina Garrigues and Virginia Ruano Pascual (2), Spain, 6-0, 6-1.

Nuria Llagostera Vives and Maria Jose Martinez Sanchez (11), Spain, def. Yan Zi and Zheng Jie (6), China, 7-5, 6-4.

Serena and Venus Williams (10), United States, def. Samantha Stosur and Rennae Stubbs (5), Australia, 6-4, 6-2.

Nathalie Dechy, France, and Mara Santangelo, Italy, def. Kveta Peschke, Czech Republic, and Lisa Raymond (3), United States, 7-5, 6-3.

Mixed

First Round

Liezel Huber, United States, and Jamie Murray (4), Britain, def. Sophie Ferguson and Chris Guccione, Australia, 6-2, 7-5.

Cara Black, Zimbabwe, and Leander Paes (1), India, def. Anna-Lena Groenefeld, Germany, and Nenad Zimonjic, Serbia, 6-4, 4-6, 10-7 tiebreak.

Chuang Chia-jung, Taiwan, and Christopher Kas, Germany, def. Galina Voskoboeva, Kazakhstan, and Kevin Ullyett, Zimbabwe, 7-6 (5), 5-7, 12-10 tiebreak.

Second Round

Sania Mirza and Mahesh Bhupathi, India, def. Anastasia Rodionova and Stephen Huss, Australia, 6-1, 6-2.

Dominika Cibulkova, Slovakia, and Jurgen Melzer, Austria, def. Jarmila Gajdosova and Samuel Groth, Australia, 6-7 (2), 6-2, 10-5 tiebreak.

Alize Cornet, France, and Marcelo Melo, Brazil, def. Flavia Pennetta, Italy, and Dusan Vemic, Serbia, 6-3, 4-6, 10-4 tiebreak.

Legends Doubles

Round Robin

Peter McNamara and Paul McNamee, Australia, def. Darren Cahill, Australia, and Mansour Bahrami, Iran, 7-5, 6-4.

Henri Leconte, France, and Mark Philippoussis, Australia, def. Todd Woodbridge and Mark Woodforde, Australia, 4-6, 7-6 (4), 10-6 tiebreak.

Wayne Arthurs and Pat Cash, Australia, def. Wally Masur and Patrick Rafter, Australia, 6-2, 6-4.

Junior Singles

Boys

First Round

Jordan Szabo, Australia, def. Ronak Manuja, India, 7-6 (3), 1-6, 13-11.

Yuki Bhambri (1), India, def. German Sanchez Delfin, Mexico, 4-6, 6-1, 8-6.

Dino Marcan (13), Croatia, def. Dino Dell'Orto, Hong Kong, 6-1, 6-3.

Luke Saville, Australia, def. Vladzimir Kruk, Belarus, 6-2, 6-1.

Stephen Hoh, Australia, def. Harry Fower, United States, 4-6, 6-3, 6-2.

Federico Gaio, Italy, def. Andrei Vasilevski, Belarus, 6-4, 3-6, 6-3.

Julien Obry (5), France, def. David Sofaer, Australia, 6-4, 6-3.

Adrien Puget (7), France, def. Jarryd Chaplin, Australia, 6-1, 6-2.

Shuichi Sekiguchi (14), Japan, def. Jordan Kelly-Houston, New Zealand, 6-2, 6-1.

Dominik Schulz, Germany, def. Jason Murray Kubler, Australia, 6-1, 6-1.

Daniel Berta, Sweden, def. Francis Casey Alcantara (10), Philippines, 6-3, 6-4.

Alexandros-Ferdinandos Georgoudas, Germany, def. Andrew Whittington, Australia, 6-3, 6-1.

Henri Laaksonen, Finland, def. Ben McLachlan, New Zealand, 6-2, 6-4.

Carlos Boluda-Purkiss (11), Spain, def. Mbonisi Ndimande, Zimbabwe, 6-2, 6-1.

Na Jung-woong, South Korea, def. Todd Volmari, Australia, 2-6, 6-3, 9-7.

Marko Krickovic, Germany, def. Jack Schipanski, Australia, 6-4, 6-3.

Julen Uriguen (2), Guatemala, def. Toni Androic, Croatia, 7-5, 6-4.

Miguel Almeida, Portugal, def. Karim-Mohamed Maamoun (16), Egypt, 7-5, 6-3.

Richard Becker, Germany, def. Huang Liang-chi (8), Taiwan, 4-6, 6-2, 6-4.

Alex Sanders, Australia, def. John Morrissey, Ireland, 7-5, 7-6 (3).

Girls

First Round

Nicha Lertpitaksinchai, Thailand, def. Rashmi Teltumbde, India, 6-2, 6-4.

Victoria Kamenskaya, Russia, def. Zarina Diyas (11), Kazakhstan, 6-3, 4-6, 7-5.

Sophie Letcher, Australia, def. Martina Kubicikova, Czech Republic, 6-3, 6-3.

Miyabi Inoue, Japan, def. Anna Arina Marenko, Russia, 2-6, 6-3, 6-0.

Lauren Embree (8), United States, def. Luksika Kumkhum, Thailand, 6-4, 6-0.

Brittany Sheed, Australia, def. Ajla Tomljanovic (6), Croatia, 6-3, 6-4.

Heather Watson (9), Britain, def. Harriet Sheahan, Australia, 6-2, 6-1.

Chanel Simmonds, South Africa, def. Natchanok Saenyaukhot, Thailand, 6-0, 6-1.

Ana Bogdan (2), Romania, def. Ashling Sumner, Australia, 6-2, 6-1.

Mia Vriens, Australia, def. Beatrice Capra, United States, 6-3, 6-3.

Kristina Mladenovic (7), France, def. Andrea Konjuh, Croatia, 6-3, 6-1.

Alexandra Krunic, Serbia, def. Hannah James, Britain, 2-6, 6-4, 7-5.

Beatrice Gumulya (15), Indonesia, def. Ester Goldfeld, United States, 3-6, 6-1, 6-4.

Zuzana Luknarova, Slovakia, def. Martina Borecka, Czech Republic, 6-4, 7-6 (3).

Eugenie Bouchard, Canada, def. Olivia Rich, Australia, 6-3, 6-1.

Anna Orlik, Belarus, def. Karina Pimkina, Russia, 6-4, 6-2.

Ksenia Kirillova (14), Russia, def. Khunpak Issara, Thailand, 6-1, 6-4.

Ksenia Pervak (3), Russia, def. Richel Hogenkamp, Netherlands, 6-4, 6-4.

Alexandra Cercone, United States, def. Lyudmyla Kichenok, Ukraine, 7-6 (3), 6-0.

Aki Yamasoto (10), Japan, def. Bianca Swanepoel, South Africa, 6-1, 6-7 (4), 7-5.