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John McEnroe has challenged Nick Kyrgios to quit professional tennis if his heart isnt in it.Commentating on American television, McEnroe was scathing of Kyrgioss demeanour before the Australian retired from his third-round US Open match against Illya Marchenko with a hip injury.Kyrgios was trailing two sets to one: 4-6 6-4 6-1 - when he called it quits.The 14th seed complained of the injury during his first two matches and said he felt like hed been hit by a bus at one point during Saturdays defeat.McEnroe has been critical and complimentary of Kyrgios in equal measures since the 21-year-olds emergence as one of tenniss hottest prospects.Last year he lashed Kyrgios for his bonehead tactics during a first-round loss to Andy Murray at Flushing Meadows, while he also had cracks at the world No.16 at Wimbledon.But his criticism of Kyrgios on Saturday night could be considered harsh, given the youngsters obvious injury concerns.Nick Kyrgios, you dont want to be a professional tennis player, do something else, McEnroe said.There was no sign of any trouble early as Kyrgios broke Marchenko on the Ukraines first service game.He then held from 15-40 to consolidate for a 3-0 lead, the only break he needed to secure the opening set.At times he toyed with the world No.63, producing a series of nonchalant backhand-down-the-line winners to appear in cruise control.Kyrgios lit up Arthur Ashe Stadium when he ran down a drop shot and conjured an incredible around-the-net-post backhand winner in the fifth game of the third set.Out of nowhere, though, Kyrgios dropped serve at 4-4 after a double-fault and forehand miss to hand Marchenko the chance to put the match back on level terms.He made no mistake as Kyrgioss movement began to diminish.After all but conceding the third set in 34 minutes, two courtside treatments from the trainer didnt help as Kyrgios repeatedly moaned.I cant move. I cant turn, mate. Whats the f***ing point?Marchenko admitted it was not the way he wanted to reach the last 16 of a slam for the first time, five days shy of his 29th birthday.I feel sorry for Nick, he said.But its a dream come true. A win is a win and a win here on Ashe is a very special feeling for me.I cannot explain how happy I am.The Ukraine will play two-time grand slam champion and third seed Stan Wawrinka on Monday for a place in the quarter-finals.The loss was Kyrgioss first in 21 matches against unseeded opponents at grand slam events and will come as a bitter disappointment for the 21-year-old who had high hopes at the Open.Despite the setback, Kyrgios is set to climb to a career-high No.15 in the world after the tournament. Edson Alvarez Jersey . That gave fans outside Joe Louis Arena another chance to ask for autographs from the 19-year-old whose stardom in the NHL has arrived earlier than most expected. Jose de Jesus Corona Jersey . -- Whether Jeremy Hill deserves a prominent role in LSUs offence this early in the season is a matter for debate. http://www.soccermexicojerseysteamstore.com/rafael-marquez-mexico-jersey/ . During the athletes parade, the 23-strong Ukrainian team was represented by a lone flagbearer in an apparent protest at the presence of Russian troops in Ukraines Crimean peninsula. Diego Reyes Jersey . -- PGA TOUR Canada member Steve Saunders took a three-stroke lead Saturday in the Web. Jesus Manuel Corona Jersey . The head of USA Boxing came out swinging Tuesday with an open letter to Tyson -- a former Olympic hopeful himself -- that accuses the former heavyweight champion of trying to poach fighters who might be candidates for the U. NEW YORK -- The Tokyo Dome will host first- and second-round games of next years World Baseball Classic, and Seoul, South Korea, will also be a first-round site.Games in Group A of the first round and Group E of the second round will be played at the Tokyo Dome from March 7-16, Major League Baseball and the Major League Baseball Players Association said Tuesday. Group A includes Australia, China, Cuba aand Japan.ddddddddddddSeoul will host Group B from March 7-11, which includes the Netherlands, South Korea, Taiwan and the winner of a qualifying group that includes Brazil, Britain, Israel and Pakistan, who play in New York at the Brooklyn Cyclones ballpark from Sept. 22-25. ' ' '