Re: US Open question?
I assume you mean on Arthur Ashe? most likely then. I believe they only schedule 3 matches on Arthur Ashe for the day session (occasionally four). Day session officially ends at 6, but earleir in arthur ashe if matches end sooner, night session starts at 7. Given that first round matches at Ashe are usually blowouts, the day at ashe should definitely be over by 5, if not earlier. Also depends how many mens macthes vs women's matches (best of 5 vs best of 3)