Alexander Zverev and Stefanos Tsitsipas turned up the heat at Roland Garros on Saturday, booking their places in the last 16, as headline acts Novak Djokovic, Naomi Osaka and Serena Williams waited to join them.
German fifth seed Zverev needed another five-setter to reach the fourth round, defeating Serbia's Dusan Lajovic 6-4, 6-2, 4-6, 1-6, 6-2.
Zverev, whose best run at a Slam came in Paris last year when he made the quarter-finals, will face Italy's Fabio Fognini for a place in the last-eight.
Zverev, 22, had also needed five sets to defeat Australia's John Millman in the first round.
On Saturday, he hit 18 aces and 52 winners past 30th seed Lajovic, the runner-up to Fognini on Monte Carlo clay in April.
Fognini needed four sets to defeat Spanish 18th seed Roberto Bautista Agut 7-6 (7/5), 6-4, 4-6, 6-1.
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The 32-year-old Fognini trails Zverev 2-1 in head-to-head meetings but crucially won their most recent meeting in Monte Carlo.
Crowd favourite Tsitsipas became the first Greek player in 83 years to reach the second week at Roland Garros as he survived a scare against Filip Krajinovic.
The sixth seed led by two sets when the match was suspended at 5-5 in the third due to darkness just before 10:00pm on Friday.
- Greek breakthrough for Tsitsipas -
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"It was important I saved those set points. Closing in the fourth set, it's important to save energy."
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