World No. 1 Simona Halep punched her ticket to the Indian Wells semi-finals with a 6-4 6-7 (5/7) 6-3 win over Croatia's Petra Martic.
The 26-year-old Halep improved to 18-1 on the season and is looking to win her second WTA Tour title of 2018.
Halep, of Romania, needed two hours and 23 minutes yesterday to put Martic away under taxing conditions as strong winds swirled around the main stadium court.
"It was difficult conditions to play in today because of the wind," she said. "It was tough to play, because the ball was really moving.
"But I just tried everything. I tried also to push a little bit the ball and then to hit it. I tried to mix it up. Was not easy at all. For both of us it was difficult."
"I just fought till the end, and I think that's why I could win."
"I returned the ball well," said Osaka. "She is one of the best servers on tour and I was able to break her quite a few times so I am really happy about that."
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