Bad back ends Peng's season

Peng Shuai was one of the biggest casualties on the opening day of the French Open as the 24th seed managed just 33 minutes of play at Roland Garros on Sunday.

"Here's the end of my competitive action of the season," said Peng, China's top female player.

A semifinalist at last year's US Open, Peng was forced to retire with a back injury while trailing Slovenia's Polona Hercog 6-0, 2-0 in the opening round.