NEW YORK (AP) -- Andy Murray and Tomas Berdych started play in their U.S. Open semifinal more than an hour late Saturday, after heavy rain and a tornado warning.
But the women's final between 14-time major champion Serena Williams and No. 1 Victoria Azarenka was postponed from Saturday night until Sunday because of more rain in the forecast. The tournament did not immediately announce what time that final would begin.
A storm hit Flushing Meadows at about 10 a.m., dumping showers that continued past 11 a.m., when Olympic champion Murray and 2010 Wimbledon runner-up Berdych were originally supposed to be on court. The match began at 12:25 p.m. in wind topping 20 mph. Saturday's schedule also included the other men's semifinal, between defending champion Novak Djokovic and fourth-seeded David Ferrer.
The U.S. Open is the only Grand Slam tournament that schedules two men's semifinals on Saturday. If both aren't completed Saturday, the men's final can't be played as scheduled Sunday and needs to be delayed until Monday - which has happened each of the past four years in New York.
The National Weather Service issued a tornado warning for the New York City boroughs of Queens - home to the USTA Billie Jean King National Tennis Center - and Brooklyn as a line of strong thunderstorms moved through Saturday morning. There was no immediate indication whether a twister actually formed or touched down.