Roger Federer of Switzerland plays a shot against Nicolas Mahut of France in Rotterdam Wednesday. — Reuters ROTTERDAM, Netherlands — Top seed and world No. 3 Roger Federer eased into the Rotterdam Open second round Wednesday with a 6-4, 6-4 win over France's Nicolas Mahut. Earlier Tomas Berdych overpowered his Czech Davis Cup teammate Lukas Rosol 6-4, 6-2 to start his campaign at the ATP Rotterdam Open with a win. Third seed Juan Del Potro made a winning debut as he played the event for the first time as he put out 2008 champion Michael Llodra 6-4, 6-7 (3-7), 6-4. In other first round results, Marcos Baghdatis beat German Matthias Bachinger 7-6 (7-2), 6-2, while Russian Alex Bogomolov advanced as Sergiy Stakhovsky quit injured trailing 6-3, 0-1. Slovak Karol Beck beat Germany's Philipp Petzschner 7-6 (8-6), 6-3. Wozniacki crashes in Doha Caroline Wozniacki, playing her first match since losing her world No. 1 ranking, crashed out of the Qatar Open Wednesday, squandering three match points in a 4-6, 6-4, 7-6 (7-3) defeat to Lucie Safarova. There was also misery for defending champion Vera Zvonareva who quit with a hip injury midway through her second round match against Romania's Monica Niculescu. Czech Safarova will next facee Russian Svetlana Kuznetsova, who defeated compatriot Maria Kirilenko 6-4, 6-4. The newly-crowned world No. 1 and Australian Open champion Victoria Azarenka advanced beating Germany's Mona Barthel 6-1, 6-0. The Belarussian top seed will now take on Romania's Simona Halep. Serb Jelena Jankovic bowed out, falling to Israeli Shahar Peer 7-6 (7/4), 6-2. Earlier, fourth-seeded Agnieszka Radwanska of Poland thrashed Great Britain's Anne Keothavong 6-1, 6-2, while French fifth seed Marion Bartoli beat Spaniard Anabel Medina Garrigues 6-2, 6-0.