Four-time French Open champion Iga Swiatek continued her smooth progress through the draw but next faces a real test against in-form Marta Kostyuk.
The Ukrainian won the biggest title of her career in Madrid earlier this month and is on a 15-match winning run on clay after beating Viktorija Golubic 6-4 6-3 in the third round.
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Swiatek has won all three of their previous matches comfortably, but Kostyuk will head into this one high on confidence.
“I definitely have a different feeling going into this match, because I feel like last time that I played her in Cincinnati, I lost this match way before it even started, and I don’t feel the same this time,” she said.
“I’m still the person who lost to her three times, and she’s won this tournament four times. So, I would love to be the one who is a favourite in this match, but I still don’t think it’s the case, even though I have this really long streak.
“But it’s not going to ruin my day or ruin my game. I have never taken a set off her. Even if I win one set in the next match, I’m going to be very happy. That’s how I look at it, and I’m excited for this match.”
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Swiatek was again a little up and down but is yet to lose more than four games in a set after seeing off fellow Pole Magda Linette.
She said of Kostyuk: “Marta is having a great season. She always had a game to play well. Did some semi-finals of big tournaments before. Now she won Madrid. So good for her.”
Eighth seed Mirra Andreeva is also through to the last 16 after beating Marie Bouzkova 6-4 6-2 while Sorana Cirstea continued her remarkable season by thumping Solana Sierra 6-0 6-0.
Romanian Cirstea announced ahead of this season that it will be her last year on tour but it has turned out to be the best of her career, with the 36-year-old breaking into the top 20 for the first time this month.
