Eighth seed Agnieszka Radwanska , a quarterfinalist in 2011, came from behind to eliminate American Bethanie Mattek-Sands.

CNN: No. 1 Wozniacki wins Melbourne opener

Oudin, a former U.S. Open quarterfinalist, won only 19 of 51 points on her serve and held just once.

NPR: Ex-No. 1 Jankovic Advances At Rainy French Open

The two-time quarterfinalist will face Russian 27th seed Mikhail Youzhny in round three.

CNN: Nadal cruises as Murray battles back at French Open

Gonzalez's best prior performance at the U.S. Open was as a quarterfinalist in 2002, and he was a semifinalist at the French Open this year.

CNN: Del Potro reaches his first U.S. Open semis

Nadal will take comfort in knowing that he beat Fognini, a talented right-hander and former French Open quarterfinalist, 6-1, 6-3 earlier this month at the Rome Masters.

CNN: Nadal wins at French Open, then questions scheduling

The 29-year-old Williams romped to a 2-0 lead in the second set, but Australian Open quarterfinalist Azarenka leveled at 3-3 and games went with serve until 5-5.

CNN: Venus defends Dubai crown to move up all-time titles ladder

Fourth seed Victoria Azarenka of Belarus also profited from an injury as U.S. Open quarterfinalist Kateryna Bondarenko of the Ukraine conceded while 4-1 down in the first set.

CNN: STORY HIGHLIGHTS

The 25-year-old -- a Wimbledon quarterfinalist last month -- also has a chance to earn a podium place in the women's doubles, reaching the semifinals with Nadia Petrova.

CNN: Sharapova and Serena Williams reach Olympic semifinals

Ninth seed Marion Bartoli beat fellow Frenchwoman Virginie Razzano 7-5 6-0 and will next face Australia's former world No. 4 Jelena Dokic, who won 6-2 6-1 against 196th-ranked Russian Anna Chakvetadze -- a quarterfinalist in 2007 on her way to a career-high No. 5.

CNN: STORY HIGHLIGHTS