By Amy Tennery and Shrivathsa Sridhar NEW YORK (Reuters) -Defending U.S. Open champion Aryna Sabalenka was given an early test before she moved into the second round while Emma Raducanu won her first match at the Grand Slam since her 2021 triumph as the tournament began a day earlier than usual on Sunday.

Emma Raducanu bagged her first US Open victory since her fairytale 2021 title triumph on Sunday with a straight sets demolition of Japanese qualifier Ena Shibahara.

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 Sunday while Novak Djokovic made a successful start to his latest bid for a record 25th Grand Slam