China's Zheng knocked out

China's Zheng Jie crashed out of Wimbledon after a 4-6, 6-2, 2-6 second-round defeat against the Czech Republic's Petra Kvitova on Thursday.

Zheng's serve unravelled in the final set when the 23rd seed was broken three times as Kvitova, ranked 38 places behind the Chinese No 2, made her extra power tell.

Zheng was hoping to repeat her 2008 heroics when she made the semi-finals.