Alexander Zverev survived a bruising four-hour battle to reach the French Open second round on Tuesday while dangerman Juan Martin del Potro also progressed.
German fifth seed Zverev, a quarter-finalist in Paris in 2018, battled past Australia's John Millman 7-6 (7/4), 6-3, 2-6, 6-7 (5/7), 6-3.
The champion in Geneva last weekend fired 57 winners past world number 56 Millman who stunned Roger Federer at the US Open last year.
However, he also committed 73 unforced errors on a blustery day in the French capital.
"John is a tough player who beat Federer so I knew it would be difficult today," said Zverev, bidding to become the first German man to win the Roland Garros title since Henner Henkel in 1937.
"It was very windy today so that made the conditions very difficult. It was a first match against a great opponent.
"I got through and that's all that matters."
"He is definitely one of the best in the game at the moment, so it's a tough challenge."
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