Second-seeded Petra Kvitova suffered an upset 6-4, 6-3 loss to Bulgarian qualifier Tsvetana Pironkova in the semifinals of the Sydney International on Thursday. ''I've been waiting for this for a long time.'' With qualifiers and main draw, she has now won seven consecutive matches in Sydney and is aiming for No. 8 in the final, where she'll meet either fifth-seeded Angelique Kerber or American Madison Keys. Men's top seed Juan Martin del Potro beat Czech veteran Radek Stepanek 6-4, 3-6, 6-3 to set up a semifinal against Russia's Dmitry Tursunov. Defending champion Bernard Tomic was playing Alexandr Dolgopolov of Ukraine in a later quarterfinal. More...