The Greek player dominated the Russian in two sets (7-6, 6-4) on Monday.
After the victories of Serbia's Novak Djokovic and Austria's Dominic Thiem on Sunday in the first day of the London Masters, Stefanos Tsitsipas won the first match of the second day on Monday (11 November). Greek dominated the Russian Daniil Medevdev in two sets (7-6, 6-4).
Ranked sixth in the world, Stefanos Tsitsipas is playing for the first time the "Masters tournament". A year ago, he won the first U21 Masters.
Over the past season, the Greek beat the top three in the world: Switzerland's Roger Federer in Melbourne, Spain's Rafael Nadal in Madrid and Novak Djokovic in Shanghai.
But against Daniil Medvedev, he remained on five failures (all surfaces combined), beaten in 2008 in Miami, the US Open and Basel, and this year in Monte Carlo and Shanghai.
The London end-of-season tournament is also a first for Daniil Medvedev (23). Before this meeting, the Russian, number 4 world, had chained six consecutive finals since early August, winning wins in Cincinnati, St. Petersburg and Shanghai, before being stopped at the end of October in Paris, at the tournament de Bercy, by the French Jeremy Chardy from the second round.
The world's number one place at stake
The London Masters brings together, until 17 November, the eight best players of the season. These are initially divided into two groups.
The group Björn Borg brings together Novak Djokovic (No. 2 worldwide), Roger Federer (No. 3), Dominic Thiem (No. 5) and Italian Matteo Berrettini (No. 8).
The group Andre Agassi meets the world No. 1, Rafael Nadal, and the three best representatives of the rising generation, Daniil Medvedev, Stefanos Tsitsipas and the German Alexander Zverev (No. 7), defending in London.
At the end of this group phase, the first two of the two groups compete in the semi-finals crossed (the winner of one hen faces the second of the other).
For Rafael Nadal and Novak Djokovic, the London tournament has a special character: at the end of this week, one and the other can finish world number one in the ranking of end of the season.
Novak Djokovic, who lost his first place to Rafael Nadal just before the Masters London, could match the American record holder Pete Sampras with a sixth season finished first.
If Rafael Nadal finishes the year number one, he will join Roger Federer and Novak Djokovic, each best player in the world five times.