After enduring through a rain delay, Garbine Muguruza rallied to beat Madison Keys and advance to the quarterfinals of the Western and Southern Open.
MASON, Ohio (AP) Wimbledon champion Garbine Muguruza overcame a long rain delay in the third set and fought off three match points Thursday before advancing to the quarterfinals of the Western & Southern Open.
The tournament's No. 4 seed beat American Madison Keys 6-4, 3-6, 7-6 (3) to extend her successful summer. Since beating Venus Williams for the Wimbledon title, she has reached the quarterfinals of her last three tournaments.
The third set was tied 2-2 when a severe storm moved through the area, causing a nearly two-hour delay. After play resumed, Keys got ahead 6-5 and was serving for the match at 40-15 but hit a couple of balls into the net. She wasted another match point before Muguruza took it to the tiebreaker and dominated.
Muguruza grew up near Barcelona and learned about the attack in the Las Ramblas district during the rain delay. She contacted relatives to make sure they were OK.
''I have been so many times to this place, it's like my home,'' she said. ''So it really shocked me.''
Keys wasn't able to make the one final shot to win it at the end.
''I obviously had some unforced errors that I wasn't happy about, but I felt like I had to go for it because she was just going to make everything,'' Keys said.
Defending champion Karolina Pliskova and Rafael Nadal—the top seed in the men's bracket—saw their matches pushed back by the rain.
Before the storm, second-seeded Simona Halep became the tournament's first quarterfinalist with a 6-4, 6-3 win over 15th-seeded Anastasija Sevastova. The straight-set win was her second in two matches.
''I'm not playing my best tennis, but winning when I'm not playing good is a plus for me,'' Halep said. ''I'm really happy about it.''
It's the fifth straight year that Halep, No. 2 in the rankings, has at least reached the Cincinnati quarterfinals. She was runner-up to Serena Williams in 2015.
In the men's bracket, Grigor Dimitrov rallied from a 4-1 second-set deficit for a 6-3, 7-5 win over Juan Martin del Potro. The seventh-seeded Dimitrov got his first career win in six matches against Del Potro.
''I played pretty sloppy for the first three games,'' Dimitrov said of the second set. ''It was all my fault. I just thought if I stayed with him and made the right decisions, I would have a chance.''
Dimitrov will face Yuichi Sugita, who advanced with a 6-7 (0), 6-3, 6-3 win over Karen Khachanov.
David Ferrer reached his first ATP Masters quarterfinal in his last 11 tries with a 6-4, 6-4 win over Pablo Carreno Busta.
AP freelance writer Mark Schmetzer contributed to this report.