Alexander Zverev defeated Holger Rune at 01:40 local time in Paris to reach the French Open quarter-finals with a thrilling five-set win.
The fourth seed needed four hours and 40 minutes to edge past Rune of Denmark 4-6 6-1 5-7 7-6 (7-2) 6-2.
It was the second match in three days that finished in the early hours of the morning at Roland Garros, after Novak Djokovic wrapped up a five-set victory against Lorenzo Musetti at 03:07 on Sunday.
Zverev will face Alex de Minaur in the men’s fourth round after the Australian beat fifth seed Daniil Medvedev earlier on Monday.
On Sunday, US Open champion Coco Gauff said tennis matches finishing at 3am were “unhealthy”.
Zverev and Rune were supposed to be on court at 20:15 local time but did not begin their warm-ups until after 21:00.
The previous match on Philippe Chatrier between Djokovic and Francisco Cerundolo lasted four hours and 39 minutes.
Zverev was playing in Paris under the shadow of an ongoing trial in Berlin relating to allegations he assaulted an ex-girlfriend, which he denies.
German Zverev, 27, is still hunting his first Grand Slam title and has fallen at the semi-final stage of the past three French Opens.
He was broken midway through the first set by 13th seed Rune, who then saved three break-back points on his way to taking the first set.
Zverev cruised to the second with three breaks but lost his serve at the end of the third, hitting a volley wildly off target when defending set point.
The pair broke each other twice in a gripping fourth set, which Zverev took with a decisive tie-break.
In the fifth set, Zverev maintained control, breaking twice to reach his 12th Grand Slam quarterfinal.
