WTA Rising Star Karolina Pliskova pulled off yet another US Open shocker, beating Ana Ivanovic - the No.8 seed and the WTA's match win leader for the year - in straight sets. Kaia Kanepi fought off two match points at 6-5 and 7-6 in the third set tie-break to edge No.24 seed and former US Open champion Sam Stosur, 3-6, 6-3, 7-6(8)