Novak Djokovic represents which country in International Tennis?

 a) Italy
 b) Serbia
 c) Austrralia
 d) USA

Serbia

Novak Djokovic is a Serbian professional tennis player.

By winning the Australian Open, Djokovic became the first Serbian player to win a grand slam singles title and the youngest player in the Open Era to have reached the semi-finals or better at all four Grand Slam events.

Serbia