In 2009, it became available on the Grandstand court.[citation needed] 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 three incorrect challenges per set, with one more being allowed in a tiebreak. Player challenges were eliminated in 2021, when the tournament became the second Grand Slam to fully incorporate Hawk-Eye Live, where all line calls are made electronically; the previous year's tournament had also incorporated Hawk-Eye Live on all courts except for Arthur Ashe and Louis Armstrong stadiums to reduce personnel during the COVID-19 pandemic.[52]