John McEnroe and Nick Kyrgios clash with umpire - video

John McEnroe and Nick Kyrgios are well versed in arguing with tennis umpires and the 2018 Laver Cup was no exception. During a match with Roger Federer, Kyrgios and McEnroe got into a heated argument over a disputed line call, with Kyrgios calling the umpire 'delusional'. It didn't help the end result, Federer dispatched Kyrgios 6-2, 6-3 to earn two points and extend the European lead to a commanding 7-1