Daniil Medvedev has won over 60 matches in 2021, making him the first player to achieve this feat.
In the first match, Lorenzo Sonego delivered on his Davis Cup Finals debut to give Italy a 1-0 lead over the United States, defeating Reilly Opelka.
The 34-year-old did not face a break point and won nine of the last 11 games to secure the victory in 60 minutes.