Serena Williams "fresh" for quarter-final

Serena Williams has claimed that she is not tired ahead of her quarter-final clash with Petra Kvitova at Wilmbledon today.

Despite being scheduled to play the day after a three-set win over Kazakh Yaroslava Shvedov, Williams said that she is not feeling tired.

"I don't feel tired at all, I feel so fresh," the sixth seed said.

"As time goes on and on, I tend to relax more and more and realise that this is a great opportunity for me."

Williams and Czech Kvitova are scheduled second on Centre Court today.