Stefanos Tsitsipas is yet to drop a set at the French Open but the fifth seed is looking to up his game when he takes on towering John Isner in the third round.
The fifth seed is seen as the biggest danger to Rafael Nadal and Novak Djokovic after a brilliant 2021 so far, and he followed up victory over Jeremy Chardy with a 6-3 6-4 6-4 success against Spaniard Pedro Martinez.
But Tsitsipas was left frustrated by his performance, saying: "I felt like I had better days at the French Open, so I would love to see myself play a little bit better next time."
He has won his past three meetings with Isner but the pair have never met on clay, with the big-serving American defeating Filip Krajinovic 7-6 (8-6) 6-1 7-6 (7-5) and thoroughly enjoying the warm, dry conditions.
"I don't think people realise how good of a surface clay can be for a guy like myself, especially if the weather is cooperating," the 36-year-old said.
"If it's 75, 80 degrees (fahrenheit) and sunny, the ball is bouncing really high and the court is playing pretty fast. These conditions out here are really tailor-made for me."
Isner skipped the Australian Open because of the length of time he would have to be away from his young family with this just his fifth tournament of the year.
But it is a formula that is working.
"If I lose here, I'm on a plane the next day and I go home and I see my wife and my kids. It's all good from there," Isner said.
"I know that after this tournament I have another break before Wimbledon. I'm playing a very limited schedule, and I'm just enjoying the times that I am on the court."
Sixth-seeded Alexander Zverev had to come from two sets down in his opening-round match but managed to keep it to three sets this time, beating qualifier Roman Safiullin 7-6 (7-4) 6-3 7-6 (7-1).
Kei Nishikori continued his remarkable record in five-set matches by beating 23rd seed Karen Khachanov 4-6 6-2 2-6 6-4 6-4.
The Japanese player has won 26 matches that have gone the distance during his career and lost only seven.
Not that he is trying to lengthen matches.
"Trust me, I hate playing five sets," he said.
"I'm not doing this on purpose."
The biggest upset of the day came when Swiss qualifier Henri Laaksonen reached the third round of a slam for the first time by eliminating 11th-seeded Roberto Bautista Agut 6-3 2-6 6-3 6-2.
Fifteenth seed Casper Ruud is a man to watch while there were also wins for Pablo Carreno Busta, Cristian Garin, Fabio Fognini and Isner's fellow giant American Reilly Opelka.