Novak Djokovic won the first edition of the ATP Cup with Serbia on Sunday. The number two in the world, together with Viktor Troicki, won the decisive doubles game of Spain in the final.

The 32-year-old Djokovic and the 33-year-old Troicki were after a good hour of playing with 6-3 and 6-4 too strong for Feliciano López and Pablo Carreño Busta and therefore took the title in Sydney.

The Spaniards, who played the double game without a tired Rafael Nadal, started well and immediately placed a break through a miss by Troicki, but the rest of the game was for Serbia.

Djokovic and Troicki, who also formed a pair in doubles in the group stage against France, won seven games in a row after a 1-3 deficit. Despite a few exciting games, López and Carreño Busta never recovered.

Final balanced after ankle games

The final between Serbia and Spain was in balance after two singles. Roberto Bautista Agut, the world's number ten, had put Spain ahead by beating Dusan Lajovic (ATP-34): 7-5 and 6-1.

Djokovic kept the title chances for Serbia alive by settling with Nadal. After almost two hours of playing, 6-2 and 7-6 (4) were on the board in favor of the sixteen-time Grand Slam winner. It was the 55th time that the current numbers one and two of the world faced each other.

In the first set, Djokovic immediately struck Nadal's service and he held onto that lead. The 33-year-old Spaniard then grew into the match and that led to a great fight. There were no breaks in the second set, but Djokovic could make the difference in the tiebreak: 7-4.

Rafael Nadal and Novak Djokovic made it a real fight in Sydney. (Photo: Pro Shots)

First edition of ATP Cup

The ATP Cup is a new country tournament with 24 teams. The Switzerland of Roger Federer and Stan Wawrinka did not participate. This also applied to the Netherlands, which did not qualify.

The tennis players worked in Australia for the Australian Open, which starts on January 20. The qualifications for the first Grand Slam tournament of the year are scheduled this week.