Paris:
The Polish star has been carrying the injury throughout the claycourt season where she lost in the second round in Madrid as well as Rome.
"I have had some shoulder problems for a while & on clay it's getting a bit worse," Radwanska tweeted.
"I'm afraid it might get even worse, with RG (Roland Garros) and grass coming up. So I felt I had to pull out. It's upsetting, I wanted to defend my title."
The French Open gets underway in Paris on May 26.
Topics mentioned in this article
Tennis
Mahesh Bhupathi
Roger Federer
Rafael Nadal
Caroline Wozniacki
Agnieszka Radwanska
Novak Djokovic
Andy Murray
Jie Zheng
Vera Zvonareva
Bernard Tomic
French Open 2013
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