'Best-ever season'

Novak Djokovic hailed his historic fourth successive ATP Tour Finals title as a dream come true after the world number one finished his astonishing campaign by routing Roger Federer in Sunday's final.

Djokovic is the first player to win the season-ending event four years in a row and his 6-3, 6-4 win over Federer was the perfect way to cap a year in which he won three Grand Slam crowns and eight other titles.

After hoisting the trophy, the 28-year-old Serb admitted he sometimes has to pinch himself to realise he is actually winning the tournaments he dreamed of playing in as a child.

"I am enjoying every moment on the court. I cherish every moment after dreaming of it as a kid," Djokovic said.

"Obviously I'm very proud, together with my team, for the achievements of the season.

"It could not have been a better finish. It's been a long season, but the best of my life."