Caroline Wozniacki & Karolína Plíšková book quarterfinal spots in the Miami Open! ‬ ‪Watch the WTA quarterfinals on Tennis Channel Plus! ‬ ‪http://tennischannel.com/news/top-stories/wozniacki-pliskova-book-quarterfinal-spots-in-miami‬

KEY BISCAYNE, Fla. -- Caroline Wozniacki advanced to the quarterfinals of the Miami Open after Garbine Muguruza retired with illness on Monday.No. 6 seed Wozniacki was up a set 7-6 when the Spaniard retired due to heat-related illness after a visit from do