Viktor Troicki (, ; born 10 February 1986) is a Serbian professional tennis player. He won his first ATP singles title at the 2010 Kremlin Cup, and his second and third ATP singles titles at the 2015 and 2016 Apia International Sydney. His biggest achievement was career-high singles ranking of world No. 12 in June 2011, along with winning the deciding rubber in Serbia's Davis Cup final against France in 2010. Since then, every Davis Cup he's attended, he has contributed to Serbia resulting in a quarterfinal or better. He is known for serving a 12-month ban for anti-doping rule violation in 2013–14 for missing a blood test.