MASON, Ohio (AP) Seventh-seeded Gregor Dimitrov defeated Feliciano Lopez 7-6 (5), 6-4 on Wednesday to reach the Western & Southern Open's round of 16.
Sixteenth-seeded Madison Keys easily reached the women's round of 16 in Cincinnati for the first time on her fourth try, needing just 50 minutes to zoom past Daria Kasatkina 6-2, 6-1. Keys, a right-hander who withdrew from last week's Rogers Cup in Toronto with a left forearm injury, next will meet fourth-seeded Garbine Muguruza, the Wimbledon champion.
After being forced to a tiebreak in the first set, Dimitrov raised his level of play in the second with 13 winners to Lopez's four. Dimitrov finished with 28 winners, twice as many as Lopez.
Other seeded women reaching the third round were eighth-seeded Svetlana Kuznetsova, with a 6-3, 6-4 win over Yulia Putintseva, and Anastasija Sevastova, with a 6-2, 7-5 win over Roberta Vinci.