Italian Flavio Cobolli dismantled American Learner Tien 6-2 6-2 6-3 on Saturday to advance to the Roland Garros fourth round in commanding fashion.
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The 10th seed reached a Grand Slam fourth round for only the second time with Tien looking sluggish throughout after needing five sets in the previous round to beat Facundo Diaz Acosta.
"I think I played well also because maybe my opponent today was a little bit tired after the last match," Cobolli told a press conference. "Maybe he helped me today to reach the fourth round.
"I was born on clay, it’s my surface, so it’s the worst court for him to play with me," he said. "Today was my day. It’s also the first match I won on a centre court at a Grand Slam, so it’s a very good day for me."
Cobolli, who is ranked 14th in the world and is now the fourth-highest-ranked player left in the men's tournament, quickly took a 3-0 lead in the first set with Tien unable to put up any resistance.
The American 18th seed went into the match on a six-match winning streak after capturing his first clay title in Geneva last week, conceded the first set, and by the time he trailed 4-1 in the second, it was clear his winning run was about to come to an end.
A Cobolli ace and a backhand error from Tien handed his opponent the second set, and the Italian kept up the pressure to move 3-1 up in the third, courtesy of another early break.
With several top favourites, including world number one, Jannik Sinner and Novak Djokovic already eliminated, the French Open is guaranteed a new Grand Slam champion, with Cobolli's name among potential winners.
"I know that there are many possibilities to have a new Grand Slam champion, for sure we will have a new Grand Slam champion. But I don't want to think about this. I have now another tough match," Cobolli said.
The 24-year-old will next play American Zachary Svajda.
BERRETTINI AND CERUNDOLO SURVIVE, FRENCH TEEN EXITS
Matteo Berrettini brought plenty of fight to his clash with Francisco Comesana, prevailing 7-6(3) 5-7 6-7(4) 6-4 7-6(15-13) in five hours and 13 minutes, to book an encounter with Sinner-slayer Juan Manuel Cerundolo.
Cerundolo came through his own epic, with a 6-4 6-7(9) 7-6(4) 6-7(4) 7-6(10-8) win over Martin Landaluce in a match that was two minutes short of six hours. But his brother Francisco went down 6-3 6-4 3-6 4-6 6-3 to Zachary Swajdaa.
Alejandro Tabilo ended the run of French 17-year-old Moise Kouame 4-6 6-3 6-4 7-6(11-9) in another long contest.
AUGER-ALIASSIME, TIAFOE FIGHT BACK TO ADVANCE
Fourth seed Felix Auger-Aliassime came from a set down to beat American Brandon Nakashima 5-7 6-1 7-6(4) 7-6(1) and set up a fourth-round meeting with Chile's Alejandro Tabilo.
American 19th seed Frances Tiafoe also staged a comeback, recovering from two sets down to defeat Portugal's Jaime Faria 4-6 6-7(2) 7-6(4) 6-1 6-2 and book his place in the last 16, where he faces Italian Matteo Arnaldi.