Federer slams umpire for giving 'pep talk' to player in match
Twenty-time Grand Slam champion Roger Federer has criticised chair umpire Mohamed Lahyani for leaving his chair and talking to Nick Kyrgios during a US Open match. "He was there for too long...Conversations can change your mindset," Federer said. "I want to help you. This isn't you. I know that. You're great for tennis," the umpire was heard saying to Kyrgios.