Singapore: Caroline Wozniacki raged at the stadium lighting and an errant line-call as she stunned French Open champion Maria Sharapova in a marathon three-setter at the WTA Finals on Tuesday.


Caroline Wozniacki celebrates her win yesterday

The relentless Dane won a thrilling encounter 7-6 (7/4), 6-7 (5/7), 6-2 in Singapore as she dented Sharapova's hopes of overtaking Serena Williams to be crowned the year-end world number one. Poland's Agnieszka Radwanska also beat Wimbledon winner Petra Kvitova 6-2, 6-3 in the White Group round robin on day two at the eight-player season finale. Wozniacki edged a tight first set before threatening to halt play in the second when stadium spotlights started sweeping the crowd during a point and shone in her eyes while serving.

She then blew up over a line call and lost the second set, before finally clinching the match in three hours, 13 minutes -- one of the longest of the season, and 16 minutes short of the tournament record. "I thought she was joking when she didn't call that out," Wozniacki said of the line judge. "I mean, obviously I had won the point, and then all of a sudden... the linesman is putting her two hands down like it's good. "I'm like, 'You got to be kidding me'.