New rules have been introduced which should prevent matches running after 11pm on both the ATP and WTA Tours.
The tours have announced no more than five matches per day should be scheduled on each court.
It is an attempt to reduce persistent late finishes, which the tours say "negatively impact players and fans".
In February 2022 in Acapulco, Germany's Alexander Zverev beat Jenson Brooksby of the US at 4:55am in the latest finish to a professional match.
Matches regularly begin after midnight, so it is hoped fewer matches will reduce the chance of a late finish.