MASON, Ohio — Wimbledon champion Garbine Muguruza overcame a long rain delay in the third set and fought off three match points on 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 fine.

“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.