Medvedev became the first Russian to win the title since Nikolay Davydenko, who won the first London edition in 2009.
Russian Daniil Medvedev won the biggest title of his career coming back strong to beat Dominic Thiem 4-6 7-6 (2) 6-4 in an absorbing climax for the ATP Finals on Sunday.
Thiem seemed on track to become the first Austrian to win the title, following his recent US Open triumph, but 24-year-old Medvedev turned the tide in a superb way.
There was no celebration as he shot a non-returnable first serve on match point to end the fight and raise the curtain on a memorable 12 years for the tournament at the O2 Arena in London before he will not be moving to Turin next year.
Fittingly, Medvedev became the first Russian to win the title since Nikolay Davydenko, who won the first London edition in 2009.
It was no more than Medvedev deserved after a sensational week in which he became only the fourth player in ATP history to beat the world top three in the same tournament.
He beat world number one Novak Djokovic in the group stage in which he went 100%, then outlived second-place Rafa Nadal in Saturday’s semi-finals before stopping Thiem who finished second for the second year in a row.
After an incredible run of form, including this month’s Paris Masters claim, the Muscovite may have been due to a dip and it happened in the first set losing a 40-0 serve lead at 2-2, giving Thiem a break with a brace. – fault.
This proved to be enough for the Austrian to pocket the first set and he went for the quick kill in the second as Medvedev’s serve and forehand were generally solid.
The Russian held on, however, saving break points at 2-2 and 3-3, and the set went into a tie-break.
Thiem led 2-0, but Medvedev then landed seven points in a row to make sure London’s farewell went through.
Thiem, who had also beaten Nadal and Djokovic this week, had spent two more hours on court than Medvedev to reach the final and he started to unravel in the third set.
Medvedev tracked him down with his relentless power and precision and the Russian secured the serve break he threatened at 2-2 when he stroked a volley.
Thiem desperately dug but world number four Medvedev remained calm to become the fifth successive title winner for the first time.