#3. Nick Kyrgios
This young Australian hothead burst into the headlines after stunning Rafael Nadal in the fourth round of the 2014 Wimbledon Championships to reach the quarter-finals on his Wimbledon debut. About six months later, Kyrgios reached his second Grand Slam quarter-final at the Australian Open which helped him reach the Top 30 of the ATP rankings. After failing to defend his quarter-final points from last year at the Wimbledon, Kyrgios’ ranking dropped below 40.Kyrgios began 2016 with a third round exit at the Australian Open following which, he won his first ATP title at the Open 13, beating two Top 10 players en route. Kyrgios then reached the semi-finals of the Dubai Tennis Championships where he was beaten by eventual winner Stan Wawrinka. After a second round exit at the Indian Wells Masters, Kyrgios ended his hard-court season by reaching the semi-finals of the Miami Masters.The 21-year old began his clay-court season by reaching the semi-finals of the Estoril Open which was followed by a quarter-final appearance at the Mutua Madrid Open. He ended his clay-court season with back-to-back third round exits at the Rome Masters and the French Open.A first round exit at the Queen’s Club Championships was followed by reaching the fourth round of Wimbledon where he was beaten by eventual champion Andy Murray. After a shocking first round exit at the Rogers Cup, Kyrgios won his second ATP title at the Atlanta Open by beating defending champion John Isner in the final.
A second round exit at the Cincinnati Masters was followed by a third round exit at the US Open where he was beaten by 71st ranked Ukrainian Illya Marchenko. Following the tournament, Kyrgios reached a career-high ranking of 15th.Kyrgios won his maiden ATP 500 title at the Japan Open by coming back from a set down to beat David Goffin. He ended the year with a third round exit at the Shanghai Masters and will end the year ranked 13th in the world, his best year-end ranking.Touted by many to be a future Grand Slam champion and a future World No.1, Kyrgios is yet to live up to expectations but he produced a few scintillating performances this year and given he maintains consistency and lowers his temper, he could well be a threat to the likes of Murray and Djokovic.