Agnieszka Radwanska reaches third round at Australian Open MELBOURNE, Australia - Agnieszka Radwanska extended the best winning streak of the year to 11 matches as she rolled into the third round of the Australian Open with a 6-3, 6-3 win over Romania's Irina-Camelia Begu on Wednesday. 4-ranked Radwanska won lead-up tournaments this month at Auckland and Sydney and is unbeaten this year. "I can play even better," said Radwanska, who lost the Wimbledon final to Serena Williams last year. I didn't really expect I could win that many matches in a row, and hopefully I can keep going. Her last two trips to the Australian Open have ended in quarterfinal losses to the eventual champion - Kim Clijsters in 2011 and Victoria Azarenka last year. With top-ranked Azarenka and No. 3 Williams on the other half of the draw, Radwanska's main obstacles to reaching the final are 2011 French Open champion Li Na, who beat Olga Goortsova of Belarus, 6-2, 7-5, to reach the third round, and potential semifinal rivals Maria Sharapova or No. 5 Angelique Kerber of Germany. Kerber advanced Wednesday with a 6-3, 6-1 win over Lucie Hradecka. Williams hurt her ankle in her opening victory Tuesday, causing speculation that her bid for a third consecutive major title could be in jeopardy. She has lost only one match since her first-round exit at the French Open last year. In early women's second-round matches Wednesday, No. 18 Julia Gorges beat Romina Oprandi, 6-3, 6-2; Russian qualifier Valeria Savinykh upset No. 15 Dominika Cibulkova, 7-6 (6), 6-4; and Kirsten Flipkens of Belgium ousted No. 23 Klara Zakopalova, 6-1, 6-0. On the men's side, 10th-seeded Nicolas Almagro was first through to the third round with a 6-4, 6-1, 6-2 win over fellow Spaniard Daniel Gimeno-Traver; No. 16-ranked Kei Nishikori of Japan beat Carlos Berlocq, 7-6 (4), 6-4, 6-1; and No. 20 Sam Querrey advanced when fellow American Brian Baker retired in the second set because of what appeared to be a right knee injury. Baker, who returned to the tour last year after almost six seasons away because of a variety of injuries, won a first-set tiebreaker and was even at 1-1 in the second. He was later pushed from Court 6 in a wheelchair. "Yeah, he's the last person that deserves anything like that with his five or six surgeries already," Querrey said. He does everything right, treats his body great, just trying to come back, and then something like that happens, it's just so unlucky. Second-ranked Roger Federer beat Benoit Paire of France, 6-2, 6-4, 6-1, in his first competitive match of the season. Other men progressing included 2009 U.S. Open champion Juan Martin del Potro, 2008 finalist Jo-Wilfried Tsonga and big-serving Canadian Milos Raonic.