New world number one Ana Ivanovic [ Images ] has pulled out of next week's Eastbourne grasscourt tournament with a muscle injury, organisers said on Wednesday.

The 20-year-old Serbian, who took the top world ranking this week and won her first grand slam title at the French Open [ Images ] on Saturday, said she was also feeling the strain of her efforts at Roland Garros [ Images ].

"I have a problem with my abductor," Ivanovic, a Wimbledon [ Images ] semi-finalist last year, said in a statement.

"I am also mentally exhausted after the French Open -- I am not ready to compete so soon after winning my first Grand Slam. I have taken this decision with some regret and I hope I can finally play in Eastbourne next year."

Frenchwoman Marion Bartoli [ Images ], Wimbledon runner-up last year and the world number 10, now heads the list of players for the $600,000 Eastbourne event, which starts on Monday.