Injured Kyrgios quits Wimbledon in third round
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The Australian won the first set 6-2 but dropped the second 6-1 when he called it quits.
"I did my abdomen at the end of the first set," said the 26-year-old Kyrgios.
"I haven't played at this level of tennis for a while and my serve is my main weapon. I need that to be firing on all cylinders."