© GettyDaniil Medvedev defeated Dominic Thiem to win the ATP Finals title in London
Daniil Medvedev claimed his maiden ATP Finals title with a three-set win against Dominic Thiem on Sunday night as London's O2 Arena bid farewell to the season-ending extravaganza.
Medvedev secured the biggest title of his career after battling from a set down to defeat third-ranked Thiem 4-6 7-6 (7-2) 6-4 in a thrilling finale.
In doing so, Medvedev became the first player in the 50-year history of the tournament to beat the world's three leading players at the same event.
The 23-year-old's triumph also meant London's tenure was bookended by Russian triumphs, with Nikolay Davydenko lifting the trophy in its first year in 2009.
Thiem and Medvedev staged impressive comebacks to set up Sunday's title decider, ousting the top two players in the men's game, Novak Djokovic and Rafael Nadal respectively.
Thiem fought hard to hold his opening service game. He battled for 10 minutes as both players settled into their rhythm.
The Russian appeared to be coasting at 40-0 in the fifth game when a missed a smash at 40-30 and a double fault cost him and the US Open champion soon consolidated for a 4-2 lead.
Thiem went on to take it 6-4 thanks to a lucky net cord winner on set point, leaving a frustrated Medvedev smiling back at his opponent as they walked back to their chairs.
It was advantage Thiem, who had won his last 21 matches having claimed the first set. But Medvedev had already snapped Nadal's 71-match winning streak to reach the final and did not appear overawed by the task in hand.
Thiem, who is now established as a major force, was attempted to go one better than last year when he lost to Stefanos Tsitsipas in the final. The Austrian was mixing his game up with slice, topspin, and flat forehands and backhands in an attempt to disrupt Medvedev's flow.
Medvedev, who entered the tournament having won the Paris Masters, saved two break points under mounting pressure to hold for 4-3 and the 24-year-old resorted to moonballing Thiem in the next game in an attempt to play havoc with his concentration. The third seed was forced into saving a break point of his own before holding serve.
The set was inevitably decided by a tie-breaker and it was Medvedev who pounced from 2-0 down by reeling off seven points in a row to send us into a final-set shoot-out. © GettyRussian Medvedev turned the tide in superb fashion to win in three sets
In a tight and tense third set, Thiem saved three break points to hold for 2-1 but after fending off two more in the fifth game, Medvedev finally nailed his third opportunity with a smart crosscourt volley in a captivating final.
The Russian was clinical on serve as he showed his versatility to keep Thiem at bay and complete a sensational comeback victory and claim the biggest title of his career in two hours and 42 minutes and finish November with an unblemished record of 10-0.
Dutchman Wesley Koolhof and Croatian Nikola Mektic ended their team debut season with their first title as they beat Jurgen Melzer and Edouard Roger-Vasselin 6-2 4-6 10-5 to lift the ATP Finals trophy.