MIAMI (AFP) — World No. 1 Iga Swiatek kept her nerve to beat 26th-ranked Linda Noskova of the Czech Republic 6-7 (7-9), 6-4, 6-4 at the WTA Miami Open on Sunday.

A day after Swiatek's closest challenger, Aryna Sabalenka, was knocked out of the tournament, the Pole faced a real test from Noskova.

The Czech had upset Swiatek in the third round of the Australian Open before the four-time Grand Slam winner gained revenge at Indian Wells.

The third meeting this year between the pair was, not surprisingly, a tight affair.

Having worked hard to recover from her opening set tie-break loss and taken the match into a deciding frame, Swiatek found herself facing three break points when serving for the match up 5-4.

But she stepped up her game to win the next five points and celebrated with a fist-pumping gesture to her box.

"It wasn't easy. There were just many ups and downs," Swiatek said.

"I'm happy that after first set I had better idea on what to do, and I just tried to do that in important moments. Sometimes we have matches like that and we need to figure out how to close them anyway."

Swiatek, who is looking to become just the second woman to win the "Sunshine Double" of Indian Wells and Miami, will face 14th seed Ekaterina Alexandrova in the Round of 16 on Monday. Alexandrova went through with a 6-4, 3-6, 6-3 win over fellow Russian Anastasia Pavlyuchenkova.

Caroline Garcia of France progressed to a fourth-round match against world No. 3 Coco Gauff with a 7-6 (7/4), 7-5 win over Naomi Osaka.

It was a hard-hitting match with the pair sharing 28 aces and Osaka had to fight to take the first set to a tie-break, saving three set points.

Garcia secured the tie-break with forehand winner but found herself trailing Osaka, 4-2, in the second before breaking back.

With Osaka serving at 5-all, Garcia forced two break points, converting the second.