Grigor Dimitrov, of Bulgaria, serves to Juan Martn del Potro, of Argentina, during the round of 16 at the Western & Southern Open tennis tournament, Thursday, Aug. 17, 2017, in Mason, Ohio. (AP Photo/John Minchillo)
John Minchillo
August 17, 2017

MASON, Ohio (AP) Grigor Dimitrov rallied from 4-1 second-set deficit for a 6-3, 7-5 win over Juan Martin del Potro and reached the Western & Southern Open quarterfinals on Thursday.

The seventh-seeded Dimitrov advanced with his first career win in six matches against Del Potro. Dimitrov improved to 15-13 in his last 28 matches after opening the season 16-1.

Second-seeded Simona Halep became the tournament's first quarterfinalist with a 6-4, 6-3 win over 15th-seeded Anastasija Sevastova.

It's the fifth straight year Halep, No. 2 in the rankings, has at least reached the W&S quarterfinals. She was runnerup to Serena Williams in 2015.

Svetlana Kuznetsova advanced with a 6-2, 6-4 win over Carla Suarez Navarro.

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