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Alexander Zverev beat defending champion Daniil Medvedev for the first time in two years to win his second ATP Finals title.
Zverev, who had lost to the Russian second seed in the group stage, turned the tables to win 6-4 6-4.
The Champion, who beat world number one Novak Djokovic on Saturday, becomes only the fourth player to beat the top two players in the world in the semi-finals and final of the tournament.
