Simona Halep, the 2018 French Open champion, announced Friday she has withdrawn from this year's tournament because she has failed to recover from a calf injury.

In this handout photograph released by The French Tennis Federation, Romania's Simona Halep poses with her trophy, after winning the women's singles final match against Sloane Stephens of the US, on day fourteen of The Roland Garros 2018 French Open tennis tournament in Paris on June 9, 2018. (Photo: AFP)

"Unfortunately the tear in my left calf muscle needs more time to recover and the timeline is just too short," said Halep, the reigning Wimbledon champion.