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Australian tennis player Nick Kyrgios celebrates his victory over Swiss tennis player Roger Federer during the Madrid Open tournament at the Caja Magica (Magic Box) sports complex in Madrid on May 6, 2015. Kyrgios won 6-7 (2/7), 7-6 (7/5), 7-6 (14/12). AFP PHOTO/ JAVIER SORIANO (Photo credit should read JAVIER SORIANO/AFP/Getty Images)

Australian tennis player Nick Kyrgios celebrates his victory over Swiss tennis player Roger Federer during the Madrid Open tournament at the Caja Magica (Magic Box) sports complex in Madrid on May 6, 2015. Kyrgios won 6-7 (2/7), 7-6 (7/5), 7-6 (14/12).   AFP PHOTO/ JAVIER SORIANO        (Photo credit should read JAVIER SORIANO/AFP/Getty Images)