Novak Djokovic capped a remarkable season with victory over Roger Federer to claim a record fourth straight ATP World Tour Finals title.
The world number one from Serbia won 6-3 6-4 in 80 minutes at London’s O2 Arena.
Djokovic also made amends for defeat by six-time champion Federer in the group stage on Tuesday.
He ends the year with 11 titles including three Grand Slams, taking his total to 10 majors.
The 28-year-old has now won the season finale five times and surpasses Ivan Lendl’s 1987 achievement, when he won his third straight Tour Finals title in New York.
The defeat by Federer on Tuesday had been his first indoors since 2012, but Djokovic responded in simply irresistible style as he despatched first Rafael Nadal and then, in the final, Federer.
It ended with a double fault from Federer as even the 17-time Grand Slam champion wilted under the pressure of such relentless accuracy from his opponent.
Aside from the trophy, another 1,300 ranking points and the cheque for £1.4m, Djokovic also draws level with Federer at 22-22 in career meetings.
He and Federer have shared 11 of the last 13 season-ending titles between them, but it is the Serb who now dominates.