Caroline Wozniacki during her quarter-final match against Karolina Pliskova at the WTAâu00c2u0080u00c2u0088tournament in Toronto on Friday. Pic/AFP

Caroline Wozniacki survived three rain delays to book her spot in the WTA Toronto tournament semi-final with a marathon 7-5, 6-7 (3/7), 6-4 victory over world No. 1 Karolina Pliskova on Friday.