Serena Williams and Maria Sharapova moved swiftly through to Wimbledon's third round as their untroubled progress continued.

Top seed, firm title favourite and five-time former champion Williams was a 6-1 6-1 winner in 50 minutes against South African Chanelle Scheepers.

"I feel okay. I don't want to feel great necessarily right now because hopefully I have several more matches I can play," said Williams. "But the goal for me is just to feel a little better every day.

"I do like to feel great in the beginning, but I think it's also important not to peak too soon, keep working on your game, always have room for improvement."

The 32-year-old American may need to find a higher gear in the next round, with her next opponent having already defeated her this year.

France's Alize Cornet beat Williams in the Dubai semi-finals in February, and has set up another shot at the 17-time grand slam winner by beating Czech player Petra Cetkovska 6-4 5-7 6-3.

Fifth seed Maria Sharapova had an untroubled 6-2 6-1 win over Swiss Timea Bacsinszky.

Canadian 13th seed Eugenie Bouchard has reached the semi-finals of both the Australian Open and French Open already this year, and is aiming to take that next step.

The 20-year-old proved too strong for Spaniard Silvia Soler Espinosa, posting a 7-5 6-1 win to match last year's run to the third round.

Andrea Petkovic, the 20th seed from Germany, stands in Bouchard's way of making progress after a 6-4 3-6 6-1 victory against Romanian Irina-Camelia Begu.

Other seeded winners on Thursday included Ana Ivanovic, last year's runner-up Sabine Lisicki and Kirsten Flipkens, but there was a casualty too as 15th seed Carla Suarez Navarro bowed out, the Spaniard beaten 7-6 (14/12) 5-7 6-2 by Kazakh player Zarina Diyas.

Heather Watson's best battling efforts were neither punchy nor pinpoint enough to overcome world number seven Angelique Kerber.

Watson summoned all the grit that guided her recovery from glandular fever to force a third set against the German ninth seed, only to slip out 6-2 5-7 6-1.

The British number one surrendered the opening set in just 26 minutes, before rallying to claim the second in twice the time – but Kerber's superior class eventually told.