A) Alexander Zverev
B) Roger Federer
C) Novak Djokovic
D) Daniil Medvedev
Explanation:
Russia’s Daniil Medvedev beat world number one Novak Djokovic (Serbia) in straight sets, 6-4, 6-4, 6-4, to win US Open 2021 men’s singles final on September 12, 2021.
