The men's world tennis number one Novak Djokovic says he's not sure if he'll be able to play for Serbia in this year's Davis Cup because of his packed agenda.
Djokovic has already said he'll skip the first round of the Davis Cup match with Sweden to be played in southern Serbian town Nis this weekend in order to get some rest from the busy season.
Djokovic returned to Serbia, where he is considered a national hero, after winning the Australian Open in the longest finals in the history of the tournament against Rafael Nadal.
He says he can't promise he'll be able to play for his country this year.
