Simone Bocelli and Fabio Fogging won the decisive point in doubles at 6: 4, 6: 4 against Jack Sock and Tommy Paul.
Lorenzo Son ego brought the Italians 6: 3, 7: 6 (9: 7) against Frances Tia foe in the first single.
The world ranking-ninth Taylor Fritz matched for the US boys with a 7: 6 (10: 8), 6: 3 over Lorenzo Musette.
The semi-finals will be used Saturday.
The 2nd video game of the initial round is already playing Australia and Croatia on Friday.
The German team starts the last round of the prestigious nation competitors without the hurt Olympic champ Alexander Zverev late Thursday afternoon.
Oscar Otto and Co. are clear outsiders against Canada.