Banned umpire worked at 2015 U.S. Open due to 'flaw'

Denis Pitner was suspended by the International Tennis Federation in August after sending information about a player to a coach during a tournament and regularly logging on to a betting account from which bets were placed on tennis matches. "We had a flaw in our system. Denis Pitner did work as a linesman at the 2015 U.S. Open," Chris Widmaier, the USTA's managing director of corporate communications, told Reuters on Friday via email.