I have no plans to quit, says Serena

(Reuters) - Serena Williams has good news for women's tennis - she has no plans to quit the sport and neither, as far as she knows, does sister Venus.

"I have no intention of stopping, and I don't think she does either," the 13-times grand-slam winner who, with her older sister has been one of the biggest characters in women's tennis for a decade and a half, said on Saturday.

"I enjoy being out there on the court so much and I've been having so much fun, so it's been great."

Despite her upbeat language, the 30-year-old American, who made a shock first-round exit at the French Open last month, seemed gloomy at a news conference at Wimbledon where she will begin the task of trying to win a fifth title next week.

Venus, who already has five, has slipped down the world rankings since being diagnosed with an autoimmune disease. She lasted until the second round at Roland Garros but Serena's opening-match defeat by Frenchwoman Virginie Razzano was the biggest upset of the tournament.

Serena, dressed all in black and less talkative than usual, said on Saturday that the Paris loss would not affect her confidence for Wimbledon, which begins on Monday.

"I think losing makes me even more motivated," said Serena, who will play Czech Barbora Zahlavova Strycova in the first round.