Serena Williams first goal is to win a point against Yaroslava Shvedova

Serena Williams says she thinks she 'can play better' and that she will need to in order to win her fifth Wimbledon title.

Serena Williams was happy to defeat Jie Zheng but says she knows she can play better and will need to if she wants a fifth Wimbledon title.

LONDON // Serena Williams admits she will have to improve in the second week of Wimbledon if she is to lift her fifth Venus Rosewater dish this Saturday.

Williams wasted little time or energy in seeing off Barbora Zahlavova Strycova and Melinda Czink earlier this week, but the American was below par in her three-set thriller over China's Jie Zheng on Saturday.

The 30 year old needed to dig deep to see off the 25th seed and move into the last 16, where she will face Sara Errani's tormentor-in-chief Yaroslava Shvedova.

Little was known about Shvedova until Saturday afternoon when she pulled off a golden set - winning 6-0 without dropping a point - against 10th seed Errani, and much harder opponents than the Kazakh await Williams in the latter stages of the tournament - she is due to face Petra Kvitova and Victoria Azarenka en route to the final - and the 13-time grand slam winner concedes she will have to improve to progress.

"Usually I return well but I hit so many errors off my returns against Zheng," Williams said. "I was just off against her, although she played unbelievable. I still think I can play better."

The first thing on Williams's agenda will be to succeed where Errani failed and win a point in the first set. "Someone told me that she got a golden set. I asked them what it was. I never knew it existed," the four-time Wimbledon champion said. "I thought she had won four grand slams in a row and the Olympics. That's the only golden thing in tennis I know of."

Shvedova has lost the only meeting between the two players three years ago in straight sets, and this is the first time she has made the fourth round at SW19. Most of her success has come in the doubles game, but her win over Errani has left Williams wary.

"She's a really good player and she's playing well," said Williams, who will play Shvedova first on Court Two. "She does everything really well. She's a solid player.

"Hopefully I'll be able to win a point in the first set. That will be my first goal, and then I'll go from there."

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