Q: In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.
Djokovic started the year by playing the Hopman Cup with fellow Serbian world No. 3 Jelena Jankovic. While he won all his round-robin matches, the team lost 1 -- 2 in the final to the second-seeded American team of Serena Williams and Mardy Fish. At the Australian Open, Djokovic reached his second consecutive Grand Slam final without dropping a set, including a victory over two-time defending champion Federer in the semi-finals. By reaching the semi-finals, Djokovic became the youngest player to have reached the semi-finals in all four Grand Slam events. In the final, Djokovic defeated unseeded Frenchman Jo-Wilfried Tsonga in four sets to earn his first Grand Slam singles title. This marked the first time since the 2005 Australian Open that a Grand Slam singles title was not won by Federer or Nadal.
A:
when did djokovic win his first grand slam