NEW YORK, Aug 24 (Reuters) - Aryna Sabalenka and Novak Djokovic overcame early tests to reach the U.S. Open second round before the Grand Slam descended into chaos late on Sunday when Daniil Medvedev launched a tirade at the match umpire and fans disrupted his opponent's service game.

Aryna Sabalenka launched the defence of her US Open crown with victory on Sunday while Novak Djokovic made a successful start to his

Benjamin Bonzi called for Medvedev to be disqualified as his first-round win was halted by six minutes when a photographer came onto the court