Tennis: Nick Kyrgios pulls out of US Open tune-up with knee pain, Andy Murray routs lucky loser

August 23, 2021 4:51 PM(REUTERS, AFP) - Australian Nick Kyrgios pulled out of his first-round match with Britain's Andy Murray at the Winston-Salem Open on Sunday (Aug 22) due to knee pain but the 26-year-old is confident he will be fit for next week's US Open.