South Korea's Chung out of French Open with ankle problem

Tipped as one of the few contenders capable of beating Rafa Nadal at Roland Garros this year, Chung said in a tweet that he had also withdrawn from this week's Lyon Open.

"Unfortunately I had to withdraw from Lyon yesterday and now Roland Garros," the 21-year-old said.

"I have been struggling with an ankle injury during the entire clay season. An MRI scan has revealed that I have build up of fluid in the ankle joint which might require a small procedure and then and extended period of rest." (Reporting by Shrivathsa Sridhar in Bengaluru; Editing by Ian Ransom)