Alexandra Eala of Philippines celebrates her win against Madison Keys during Day 6 of the Miami Open at Hard Rock Stadium on March 23, 2025 in Miami Gardens, Florida. Al Bello, Getty Images/AFP 

MANILA -- Filipina tennis star Alex Eala pulled off another massive upset in the third round of the Miami Open, beating world No. 5 Madison Keys of the United States, 6-4, 6-2 early Monday (Manila time).

Two days after shocking world No. 25 Jelena Ostapenko in the second round, Eala one-upped herself by taking down the reigning Australian Open champion to enter the round-of-16.

READ: Alex Eala earns major upset, beats World #25 Jelena Ostapenko in Miami Open 2nd round

Eala outplayed Keys from the baseline in the opening set, attacking the American's second serve en route to victory. Her confidence and high-level hitting continued in Set 2, where she forced Keys into a handful of errors.

Eala is the first Filipino woman in the Open Era to beat a top-10 opponent since the ranking system came into being in 1975.

After the match, Eala thanked her parents and the Filipinos in Miami who came out to support her.

"I can't wait to call my mom and dad. Nakuha natin, dad, mom," said the 19-year-old, who now has beaten two former Grand Slam champions.

"I knew she would come out hitting. I just kept my head down and stayed humble," added Eala.

Up next for Eala is world No. 10 Paula Badosa of Spain.

In other results, Iga Swiatek overcame a determined Elise Mertens to secure a 7-6 (7/2), 6-1 victory and take her place in the last 16 at a WTA 1000 tournament for a record 25th straight event.

Second-seeded Swiatek has not lost before the last 16 at this level since Cincinnati 2021.

The Pole was 5-2 up in the first set but Mertens fought back to make it 5-5 before Swiatek was able to regain her dominance in the tie-break.

Swiatek didn't look back from that point on as she made short-work of the second set and she acknowledged she had struggled on her serve. Her first service percentage went from 60% to 79% in the second set.

"In the first set, my serve wasn't working perfectly. I'm glad I was patient enough to just work for it, and in the second set I felt much better," Swiatek said.

Ukrainian Elina Svitolina, the 22nd seed, overcame 15th-seeded Czech Karolina Muchova to move into the fourth round with a 6-2, 3-6, 6-2 win.

In the men's draw, Greece's Stefanos Tsitsipas, who won his first title in over a year last month at Dubai, fell to 24th-seeded American Sebastian Korda 7-6 (7/4), 6-3.

Bulgaria's Grigor Dimitrov battled to a 6-7 (7/3), 6-4, 7-5 win over Karen Khachanov in a contest in which the baseline predictably dominated.

The 33-year-old's victory, secured over two hours and 38 minutes, made Dimitrov the fourth active player to tally 100 Masters 1000 hard-court wins.

"It's great. Last year I think I hit 100 wins indoors, now this. It's beautiful I think every time you hit such a milestone," said Dimitrov.

"We know each other very well, we practice with each other a lot, so there weren't really secrets. At the end of the day, it came down to a few points."

Later on Sunday, fourth seed Novak Djokovic is in action against Argentine Camilo Ugo Carabelli. -- with a report from Agence France-Presse

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