Taylor Fritz recovered from losing four set points in the opening set to help the United States to a 3-0 ATP Cup win over Canada.
Fritz eventually overcame Felix Auger-Aliassime 6-7(6) 6-4 6-4 to wrap up victory after John Isner had given the USA a 1-0 lead with a straight-sets triumph against Brayden Schnur.
In the doubles, Fritz and Isner defeated Auger-Aliassime and Denis Shapovalov 6-4 6-4.
"We're feeling really good," Fritz said. "When we played in 2020, we didn't win a match, so first win for Team USA at the ATP Cup. It feels good."
Russia won the deciding doubles rubber to earn a 2-1 win over France.
Roman Safiullin saw off Arthur Rinderknech 2-6 7-5 6-3 before Ugo Humbert levelled the match with a 6-7(5) 7-5 7-6(2) win over world number two Daniil Medvedev.
Safiullin and Medvedev then teamed up to secure the match with a 6-4 6-4 win over Rinderknech and Humbert.