Doha, Qatar (SportsNetwork.com) - Wimbledon champion Petra Kvitova and U.S. Open runner-up Caroline Wozniacki were among the second-round winners Wednesday at the Qatar Open tennis event.

The top-seeded left-handed Kvitova was handling former world No. 1 Jelena Jankovic, 6-3, 1-1, when the Serb retired on Day 3, while the third-seeded former top-ranked star Wozniacki was pasting Alexandra Dulgheru, 6-1, 3-0, when the Romanian retired on the hardcourts at Khalifa International Tennis Complex.

Also on Day 3, fourth-seeded former Wimbledon finalist Agnieszka Radwanska whipped Italian Flavia Pennetta 6-1, 6-1 and Czech Lucie Safarova surprised fifth-seeded Russian fellow left-hander Ekaterina Makarova 6-2, 6-7 (5-7), 6-3.

The 2015 Doha titlist will claim $124,000.