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Nick Kyrgios enjoys one of the 'favorite weeks' of his life with sixth title

(CNN)Australian Nick Kyrgios enjoyed one of the "favorite weeks of my life" after winning his sixth ATP title at the Citi Open Sunday. The 24-year-old beat Daniil Medvedev in straight sets 7-6 (8-6) 7-6 (7-4) in an entertaining final which demonstrated the potential of the box-office star. Kyrgios has long been a divisive figure in tennis. When focused, he's one of the most dangerous players on tour but the youngster is no stranger to controversy both on and off the court. "This has honestly been one of my favorite weeks of my life," he said after winning in Washington. "I've made massive strides." READ: Cori 'Coco' Gauff, 15, says she will 'learn a lot' after losing in straight setsREAD: Worth $5 billion, the world's most valuable sports ...