London: Novak Djokovic has history in his sights as the world number one aims to cap the greatest year of his life by winning a fourth successive ATP Tour Finals title.
Even by Djokovic's already sky-high standards, 2015 has been a golden period for the 10-time Grand Slam winner, who has cemented his position as the sport's preeminent force with one of the best single-seasons in the Open era.
With 78 wins from his 83 matches over the last 11 months, the 28-year-old Serb has amassed 10 titles including the Australian and US Opens, Wimbledon and a record six Masters tournaments.
Rise in fortunes
The prize money from that haul has swelled Djokovic's bank balance by $16.7 million and underlined his right to be regarded as the world's best, yet he has shown no signs of slowing down in the closing weeks of the campaign.
Since losing to Roger Federer in the Cincinnati final in August, Djokovic has embarked on a 22-match winning run that has brought him the US Open, the China Open and Masters titles in Shanghai and Paris.
Now Djokovic arrives at London's O2 Arena hoping to win the prestigious season-ending Tour Finals for a fifth time. Djokovic, who opens his Tour Finals challenge against Japan's Kei Nishikori on Sunday, would become the first player to win the event four years in a row if he lifts the trophy on November 22 and, ominously for his rivals, he claims he feels in the form of his life.
"I feel this season is even better than 2011. I'm in love with the game," Djokovic said.
The number of wins Novak Djokovic has registered from his 83 matches over the last 11 months
The number of titles the Serb has amassed in 2015, including the Australian and US Opens, Wimbledon and a record six Masters tourneys
The winning run Djokovic has embarked on since his loss to Roger Federer in the Cincinnati final in August
The prize money Djokovic earned in this year so far