ATP and WTA Introduce New Rules to Tackle Late-Night Tennis Matches

The changes, which limit the number of matches per day and restrict late-night games, come in response to concerns over player health and sleep schedules.

The ATP and WTA have jointly announced new scheduling regulations to address the issue of late-night tennis matches, which have been affecting players' health and sleep schedules.
The new rules restrict the number of matches per day to five per court, with three during the day and two in the evening. No matches will start after 11 P.M. unless approved by the supervisor in consultation with the management.
Matches not on court by 10:30 P.M. are to be moved to an alternative court, by no later than 11:00 P.M.
These changes come as a major relief to players like Iga Swiatek, who had previously criticized the WTA over poor scheduling.
The WTA and ATP are also conducting a strategic review to try to add more consistency to the kinds of tennis balls used, following complaints by players that the week-to-week changes in equipment are problematic and possibly causing more injuries.