NEW YORK, Aug. 26 -- The U.S. Open descended into chaos on Sunday when a photographer came onto the court as Daniil Medvedev faced match point in his first-round match, sparking a spectacular meltdown from the Russian. Former champion Medvedev was eventually knocked out 6-3, 7-5, 6-7(5), 0-6, 6-4 by Frenchman Benjamin Bonzi, who threatened to walk off the court at one point and called for the Russian to be disqualified. Serving for the match at 6-3, 7-5, 5-4, Bonzi was preparing to play his second serve when the photographer stepped onto the court surface. The disruption led chair umpire Greg Allensworth to put Bonzi back onto his first serve, sparking a wild outburst from Medvedev. "Are you a man? Are you a man? Why are you shaking?" the Russian shouted as he stormed towards the chair. The match was halted for about six minutes as jeers, whistles and boos rang out around Louis Armstrong Stadium. P13...