Muguruza back from the brink to beat Keys

Stephens crashes out, Pliskova through at Miami Open

Wimbledon champion Garbiñe Muguruza held on to beat Madison Keys at the Cincinnati Masters on Thursday, saving three match points to win 6-4, 3-6, 7-6(3) and move into the quarter-finals.

Following a lengthy delay for rain, the fourth-seeded Spaniard found herself 6-5 down in the deciding set with Keys serving at 40-15.

The sixth seed then hit two shots into the net and wasted another break point before Muguruza broke Keys to force a tiebreak, which she duly won.

Keys lamented her missed opportunity after the match.

"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.

Muguruza now faces Russia’s Svetlana Kuznetsova in the quarter-finals after she beat Spain’s Carla Suarez Navarro in straight sets.

Earlier in the day, second seed Simona Halep saw off the challenge of 15th-seed Anastasija Sevastova 6-4, 6-3.

"I'm not playing my best tennis, but winning when I'm not playing good is a plus for me," said Halep.

In other action on Thursday, sixth seed Caroline Wozniacki defeated Australia’s Ash Barty 6-4, 6-2, while Johanna Konta (7) defeated Dominika Cibulkova (11) 6-3, 6-4.

Top seed Karolina Pliskova’s match was suspended with the world number one leading Camila Giorgi of Italy 3-0.