Tennis - Errani the latest seed to suffer defeat in Sydney

Sara Errani was the latest seed to tumble out of the Apia International at Sydney, losing 7-6(2) 6-3 to Tsvetana Pironkova.

The women's draw, which has already seen top seed Agnieszka Radwanska and former world number one Caroline Wozniacki sent packing, lost the third-seeded Italian, last year's surprise French Open semi-finalist, in what was a surprise loss to Bulgaria's Pironkova.

The Italian world number seven took a medical time-out in the second set to have treatment on her lower back, raising concerns over her fitness ahead of the year's first grand slam.

One-time Wimbledon semi-finalist Pironkova will play second seed and former Wimbledon champion Petra Kvitova, who wore down Lucie Safarova 7-6 6-2, for a place in the final.

Sam Stosur's stuttering revival after a dismal Hopman Cup continued with a second straight win at the Hobart International in front of home fans.

The former U.S. Open champion had to save two match points against 54th-ranked Frenchwoman Kristina Mladenovic as she laboured through a 6-4 2-6 7-6 (9-7) match blighted by an astonishing 22 double-faults from both players.