Viktor Troicki achieved his career high ranking of 24 in August 2009. He started playing tennis at the age of 5. From 2003, he started playing Futures tournaments in Serbia; and in 2004, he won his first tennis tournament in Nis. He won his first Challenger Tournaments also in Belgrade, on January 20, 2005, beating Fabio Colangelo from Italy 6–2, 6–1.
He made his debut on ATP Tour in Tokyo, in October 2006. He passed the first round, beating Fernando Vicente from Spain 6–7(4), 6–4, 6-2, but lost in the second round to then World Number 1 Roger Federer, in a tight match, 7–6(2), 7–6(3).
In July 2007, in Umag as a qualifier, he had his biggest win - over world No. 3, countryman and friend Novak Djokovic in a second round; he eventually lost in hist first semi-final to Andrei Pavel of Romania.
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