Nicholas Hilmy Kyrgios (/ˈkɪriɒs/ KIRR-ee-oss; born 27 April 1995) is an Australian professional tennis player. As of March 2020, he is ranked No. 40 in the world in men's singles by the Association of Tennis Professionals (ATP) and is the second highest-ranked Australian in the ATP rankings. Kyrgios has won six ATP titles and has reached eight ATP finals, including the 2017 Cincinnati Masters.
In his junior career, Kyrgios won the boys' singles event at the 2013 Australian Open and the boys' doubles event at the 2013 Wimbledon Championships. During his professional career, Kyrgios reached the quarterfinals of the 2014 Wimbledon Championships—upsetting then world no. 1 Rafael Nadal and world no. 13 Richard Gasquet en route—and the quarterfinals of the 2015 Australian Open. Kyrgios is only the third player, after Dominik Hrbaty and fellow Australian Lleyton Hewitt, to have beaten Roger Federer, Rafael Nadal, and Novak Djokovic the first time he played each of them.