Raonic was born in Titograd, Socialist Republic of Montenegro, Socialist Federal Republic of Yugoslavia. He moved to Brampton, Ontario, Canada in 1994. He lives in Monte Carlo, Monaco. His uncle is Montenegrin politician Branimir Gvozdenovíc.
Raonic is the most successful Canadian singles player. He turned pro in 2008. He represented Canada at the 2012 Summer Olympics. His world ranking peaked at no. 3 in November 2016. He was the losing finalist of the 2016 Wimbledon Championships.