Nick Kyrgios says he feels 'composed' and 'mature' as he outlasts Brandon Nakashima to reach Wimbledon quarterfinals

    Kyrgios celebrates match point against Nakashima

    Centre Court, Wimbledon (CNN)Eight years on from his last quarterfinals appearance at Wimbledon, Nick Kyrgios says he feels "composed" and "mature" after reaching the same stage with a battling, five-set victory against Brandon Nakashima.

    It was a far more subdued performance from Kyrgios on Centre Court compared to his fiery match against Stefanos Tsitsipas on Saturday, and the Australian admitted he was far from his best as he triumphed 4-6 6-4 7-6 (7-2) 3-6 6-2.
    Only when he put away a forehand volley on his first match point in the fifth set did Kyrgios show real signs of emotion -- looking to the crowd and roaring in delight.
      The victory was hard-fought, too, as the 27-year-old appeared to be struggling with a shoulder problem throughout the match and needed treatment from the physio at 3-2 in the third set.
        "I need a glass of wine for sure tonight," he admitted in his on-court interview after the match.
        Kyrgios required medical treatment midway through his match against Nakashima.
        Next up for Kyrgios is Chile's Cristian Garin, who became the first man at this year's tournament to come back from two sets down as he defeated Australian Alex de Minaur.
        Kyrgios has now reached his first grand slam quarterfinal in seven years and remains unbeaten in all of his five-set encounters at Wimbledon.
          "Today, I was almost just smiling and laughing to myself on the far side, knowing that I was locked in an absolute battle," he told reporters. "In the past I wasn't able to enjoy that ... I was almost enjoying the competitiveness (today)."
          American Nakashima, playing in his first fourth-round match at a grand slam, claimed the first set with the first break point of the match, but Kyrgios, despite clutching his shoulder a number of times, hit back with a break at the start of the second.
          The serve proved to be Kyrgios' best weapon, with one ace clocking 137 miles per hour as he saw out the set and leveled the match.
          There were few opportunities for either player to break in the third set, but Kyrgios gained the upper hand in the tie break, slapping a cross-court forehand beyond Nakashima's reach to move ahead in the match.
          Nakashima enjoyed his best run at this year's Wimbledon having been knocked out in the first round last year.
          The 20-year-old, however, was far from done and broke for a 4-3 lead in the fourth. What followed was a strange passage of play in which Kyrgios appeared to tank the remainder of the set with slow serves and lackluster ground shots.
          "Complete rope-a-dope tactic," he later explained. "I just threw away that service game. I knew that he was in a rhythm, he was starting to get on top of me and I just wanted to throw him off a little bit."
          That meant the match went to a decider, only for Kyrgios to produce some of his best tennis while Nakashima faded.
          A double break of se