An Australian Open ball kid was caught in an unfortunate moment during the second-round match between Aleksandar Kovacevic and Karen Khachanov on Wednesday. The youngster accidentally ran on court and caught a ball mid-point to lead to complaints from Khachanov. Khachanov led by one set and was 2-1 up in the second at the time of the incident. American star Kovacevic had break point when his return from a Khachanov serve appeared to be heading out. The ball kid standing beside the net ran on and caught the ball before it hit the ground. The crowd gasped as they realised what had happened. Umpi…