World number two Andy Murray withstood the challenge of Nick Kyrgios on Monday, sweeping aside the mercurial Australian 7-5 6-1 6-4 on Centre Court to reach his ninth straight Wimbledon quarter-final.For much of a pulsating first set 15th seed Kyrgios had the edge, however, thudding down serves at close to 140 mph that the second-seeded Scot struggled to reach let alone control. (Also read: Serena Williams powers into Wimbledon quarter-finals)Murray’s serve, meanwhile, was misfiring and, under darkening skies and roared on by a partisan crowd, he had to dig deep to stay on terms with the Australian. (Also read: Federer storms into Wimbledon quarters, equals Navratilova’s win record)The set and the match turned in the 12th game, when a combination of Kyrgios errors and two inspired Murray backhands presented the Scot with three break points. Kyrgios saved the first two with booming serves but Murray converted the third when the Australian netted a forehand volley.Thereafter Kyrgios’s focus and intensity wavered, the Briton breaking him twice in a second set that flew by in 26 minutes. He broke once more in the third, closing out the contest with an ace on his third match point. (Also read: Wimbledon: Novak Djokovic slayer Sam Querrey moves into the quarter-finals)Murray will face swashbuckling Frenchman Jo-Wilfried Tsonga, the 12th seed, in the quarter-finals.