sentences:  Instant replay was available only on the Arthur Ashe Stadium and Louis Armstrong Stadium courts through the 2008 tournament.In 2009, it became available on the Grandstand court.Starting in 2018, all competition courts are outfitted with Hawk-Eye and all matches in the main draws (Men's and Women's Singles and Doubles) follow the same procedure each player is allowed 3 incorrect challenges per set, with one more being allowed in a tiebreak.