Serena and Sharapova progress

  • Last Updated: March 25 2014, 9:08 GMT

Serena Williams had few problems reaching the fifth round of the Sony Open but Maria Sharapova battled through.

Serena Williams: Easy victory on Monday
Serena Williams: Easy victory on Monday

The fourth seeded Sharapova was on court for two hours against the 19th-ranked Kirsten Flipkens, losing the first set 6-3 before taking the next two 6-4 6-1.

Consistency has never been a problem for Williams and she swept aside Coco Vandeweghe 6-3 6-1.

Her reward is a meeting with Angelique Kerber - a three-set winner over Ekaterina Makarova - while Sharapova's next opponent had a remarkable day.

Petra Kvitova lost the first set to Ana Ivanovic 6-3 but then rattled off two bagel sets to win 6-0 6-0 in a quite remarkable turnaround that saw Ivanovic double fault 10 times.

Third seed Agnieszka Radwanska was also taken to three sets but came through 7-6 (7/5) 5-7 6-2 against Elina Svitolina.

There were no such concerns for Li Na, with the second seed thrashing 15th seeded Carla Suarez Navarro 6-0 6-2, while Caroline Wozniacki, seeded 11th, hammered Varvara Lepchenko 6-0 6-1.Meanwhile, 10th seed Dominika Cibulkova needed three sets to see off three-time winner Venus Williams, who slipped to a 6-1 5-7 6-3 defeat.