The defeat ended Williams's hopes of a third-straight Grand Slam title, having triumphed at the 2008 US Open and this year's Australian Open.

She has now set her sights on winning a third Wimbledon singles title, but admits that in previous years she has struggled to adapt to the transition between clay and grass.

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"For me it's frustrating, because the balls are flying and going so fast (on grass)," she said. "It's totally different and I always start out really, really bad, so it's just frustrating for me.

"I don't wish there was more of a gap (between the tournaments) though. It's like, I lost here, maybe I can do better at Wimbledon. I wish it were tomorrow."

Williams has not tasted singles glory at Roland Garros or Wimbledon since the purple patch in 2002-2003 when she won five majors in just over a year, winning back-to-back Wimbledons and clinching her only French Open title to date in 2002.

She has since made two final appearances in London, losing to a 17-year-old Maria Sharapova of Russia in 2004 and then to her elder sister Venus in 2008.

Asked about her targets for the Wimbledon fortnight, Williams replied: "My goal is to do better than last year, hopefully."

The former World No 1 struggled for form and fitness going into Roland Garros and conceded that she had

"I started out really bad," she said. "Just physically, I wasn't the best. I was trying to make it. I didn't have great matches coming in here, and I started out on a losing streak.

"I guess I was just on a hope and a dream, and now it's over."

With Williams out of the way, Russia's Dinara Safina will seek to confirm her status as women's World No 1 by winning her first Grand Slam after two unsuccessful attempts.

A beaten finalist in Paris against Ana Ivanovic last year, Safina was out-classed by Williams in this year's Australian Open final, but the American thinks the 23-year-old's time may have finally come.

"I already think she's definitely authenticated as the World No 1," Williams said.

"I definitely see her as a favourite."