Former world No 2 Tommy Haas played his first match in 15 months on Monday and admitted that even having passed his 33rd birthday, he is not ready to quit.
Roger Federer cruised into the French Open second round on Monday and then hit out at the decision by Roland Garros organizers to introduce new balls at the tournament.
World No. 1 Rafael Nadal of Spain met strong challenges from American John Isner and needed to play five sets to go through the first round in the men'singles at the French Open on Tuesday.
China's world number seven Li Na was taken to three sets by Czech Barbora Zahlavova Strycova before prevailing 6-3, 6-7, 6-3 in their French Open first-round encounter on Tuesday.
The defending champion Francesca Schiavone of Italy romped into the second round of the women's singles by sweeping American Melanie Oudin 6-2, 6-0 at the French Open on Monday.
Novak Djokovic extended his unbeaten record in 2011 to 38 wins on Monday with a straight sets dismissal of hapless Dutchman Thiemo De Bakker in the first round of the French Open.
Gusty winds and half-empty stands gave no sense of the usual Parisian glamour as last year's French Open runner-up Samantha Stosur began with an easy win yesterday and Lleyton Hewitt pulled out injured.
Kim Clijsters may not have played a match in almost two months when she returns at the French Open but if anyone can make a big impression after such a lengthy absence the Belgian can.
World number 11 Andy Roddick pulled out of the French Open on Thursday due to a right shoulder injury, the Roland Garros organisers said in a statement.
America's three-time Wimbledon finalist Andy Roddick is likely to miss the French Open after he was forced to withdraw from the ATP tournament in Nice on Tuesday because of a shoulder injury.