Fourth seed Jannik Sinner withdrew before his third-round match at the Paris Masters on Thursday blaming “fatigue” after finishing his previous match after half-past two in the morning.
The night before, the Italian started his match against American Mackenzie McDonald after midnight and battled to a three-set victory in two hours 16 minutes.
Sinner was due on centre court on Thursday as the fourth match on the schedule to face Australian 13th seed Alex de Minaur.
Darren Cahill, who coaches Sinner, said on Instagram that he was happy with the victory but criticised “zero care for players welfare with Paris scheduling”.