ANTWERP, Belgium -- Amelie Mauresmo pulled out of the Diamond Games after she injured her thigh during her loss to Serena Williams in the Gaz de France final Sunday.

Mauresmo returned to competition after being sidelined for 16 weeks by a knee operation and immediately reached the final of the Paris event, losing 6-3, 6-2 to world No. 1 Williams.

Organizers of the $585,000 WTA event in Antwerp said the world's sixth-ranked player decided to withdraw at the last moment. No details of her thigh injury were immediately available.

Venus Williams is the top seed at the Diamond Games.