The U.S. Open will finish on a Monday for the fifth consecutive year.
With a potentially dangerous storm expected Saturday night in Flushing Meadows, the tournament suspended play for the day while David Ferrer was leading Novak Djokovic 5-2 in the first set of their semifinal. Spectators were told to leave Arthur Ashe Stadium.
That match was scheduled to resume Sunday, with the men's final shifted from its originally scheduled Sunday slot to Monday. Andy Murray reached the final by beating Tomas Berdych.
Earlier, the women's final between Serena Williams and Victoria Azarenka that was supposed to be played Saturday night was shifted to Sunday.