In which year did Djokovic win his first Grand Slam title? The answer is 2008. He won the 2008 Australian Open men's singles title in Melbourne, defeating France's Jo-Wilfried Tsonga in the final.
Djokovic entered the tournament as the third seed and reached the final without dropping a set. In the semifinals, he defeated defending champion Roger Federer in straight sets. He then beat the unseeded Tsonga 4–6, 6–4, 6–3, 7–6 in the championship match, earning his first major singles trophy at age 20.
The victory made Djokovic the first Serbian player to win a Grand Slam singles title. It also ended a period in which every men's singles major since the 2005 Australian Open had been won by Federer or Rafael Nadal. Djokovic would go on to win the French Open, Wimbledon, and US Open, completing a career Grand Slam.
A common mix-up is confusing his first Grand Slam title with his first major final: the final itself came at the 2007 US Open, where he lost to Federer.