The final act in the Grand Slam® season, the US Open is one of the world’s oldest tennis events, with roots dating back to 1881. Staged at the USTA Billie Jean King National Tennis Center in New York City and home to the Arthur Ashe Stadium – the largest tennis arena in the world – the tournament is held over a two-week period in late August and early September. Rolex became Official Sponsor and Official Timekeeper in 2018.