Alexander Zverev of Germany defeated world number one Novak Djokovic to win his maiden ATP World Tour Finals title on Sunday. The 21-year-old won with a scoreline of 6-4, 6-3 and became the youngest player to win the tournament since Djokovic himself in 2008. Further, Zverev became the first German to win the season-ending tournament since Boris Becker in 1995.