The American grandmaster earned $150,000 for winning the tournament, while the Russian grandmaster earned $85,000.
The score in the match was 2.5:2.5.
In Armageddon, the American won with white pieces.
In the semi-finals of the tournament, Nepomniachtchi defeated the Norwegian Magnus Carlsen.
Earlier, the Russian commented on the loss to Nakamura in the final of the Fischer World Chess Championship.