No.3 seed Elina Svitolina is now the highest-ranked player remaining in the draw, while AO 2020 champion Sofia Kenin and two-time Wimbledon victor Petra Kvitova are the only players still in contention who have already won Grand Slam titles.
"I was thinking about it (last year's game against Halep), because as I said, it gave me, it was like a huge lesson for me", she said.
Back then, though, Iga Swiatek had only just turned 18, and was outside the top 100, and had been combining her tennis career with completion of her high-school education.
Swiatek, who also reached the fourth round this year at Melbourne Park, has said that having recently passed her school exams, she now wants to fully focus on her tennis, to see whether she should make a career of it or head to university. But it was at this victory that Iga Swiatek could only say "Even I am surprised that I can do that".
"And right now I feel like I can handle the pressure".
Halep had a look of steely determination on her face, and that fight came through in the third game, an eight-minute battle of wills, multiple deuces and a couple more break points, eventually held by Halep.
She hit 17 winners in the first set and, although Halep made only two unforced errors, she was simply not able to get into the match. Now she will play Swiatek in the French Open quarter-finals.
The unseeded Swiatek took Halep apart in a quite astonishing performance in the first set.
"I remember how I played a year ago so I can just see that I made huge progress".
Swiatek's victory was quickly followed by another surprise when Trevisan registered a 6-4, 6-4 victory over fifth seed Kiki Bertens, a semi-finalist in 2016. It was a little bit cold and I couldn't be at my best but it was her match today. She never faced a break point and punished Halep with her crunching baseline shots and exquisite net play.
She reached the semifinals in 2020 and the final in 2018. "Oh my god, I can't believe it".
Swiatek, ranked 54th in the world, dominated in the rallies as she won three straight games before breaking Halep's serve a second time for a 5-1 lead after just 20 minutes.
Trevisan, who was a qualifier for the tournament, has already beaten a number of big names on her run to the last eight of the French Open.
There will be a new French Open women's champion crowed on Saturday.
The defeats for Halep and Bertens mean there are only four seeds remaining in the women's singles - Elina Svitolina, Sofia Kenin, Petra Kvitova and Ons Jabeur. Thiem, runner-up to the King of Clay the past two years, plays No. 12 seed Diego Schwartzman, a 6-1, 6-3, 6-4 victor against Lorenzo Sonego.
The day's other last 16 match features Diego Schwartzman, the 12th-seeded Argentine who stunned Nadal in Rome on the eve of Roland Garros.
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