Djokovic won the prestigious season-ending Tour Finals for the third time with a dominant 6-3, 6-4 victory over world number one Rafael Nadal at the O2 Arena in London yesterday.
The 26-year-old has played some of the best tennis of his life since losing the US Open final against Nadal in September and Monday's win was his 22nd successive match victory -- a run that has brought him titles in Beijing, Shanghai, Paris and now London.
Serbia last won the Davis Cup in 2010 and Djokovic would dearly love to repeat that triumph.
"It's a fact that it's been a very long season for me and I'm exhausted in every way. But God knows if we're going to have as a country another opportunity like this to win a Davis Cup title at home," Djokovic said.
"I'm going to do my best to recover the next three days and get ready for that one."
Once Djokovic has finished with his national service, he will finally be able to put his feet up and reflect on a year that brought him joy and despair in equal measure.
After winning the Australian Open for the fourth time in January, he suffered a frustrating semi-final loss to Nadal at the French Open -- the one Grand Slam title he has never won.
