Serena Williams remaining cautious for French Open

World number one Serena Williams has revealed that she is adopting a cautious attitude for the upcoming French Open.

The American suffered her first ever opening-round defeat in a Grand Slam at last year's tournament when she was stunned by France's Virginie Razzano.

"Last year I was feeling excellent but didn't do great and this year I am cautious and I want to work hard and stay focused," Williams is quoted as saying by Eurosport.

Williams's only triumph at the French Open came in 2002 following a victory over her sister Venus in the final.