'America's Got Talent' Fave Sal Valentinetti Returns to Perform Frank Sinatra Hit: 'Champions' Exclusive

America's Got Talent: The Champions got a trip back to the 1950s when Season 11 favorite Sal Valentinetti returned to perform a smooth rendition of Frank Sinatra's "Mack the Knife."

Dressed in his signature white tuxedo, the 23-year-old crooner mused the legend's melody with swagger. Judges Heidi Klum and Simon Cowell are seen smiling wide and snapping along to the beat.

"Sinatra to me was an all around entertainer. I try to use my personality as much as can and I think that is what Sinatra did so effortlessly,” Valentinetti previously told Billboard in 2016. “It’s good to be able to channel Frank and be that guy up there. That’s the same guy I am. Frank was a confident, larger than life person, and I try to be the same style of entertainer.”

Watch an exclusive clip of his "Mack the Knife" performance above, and catch the full performance on The Champions on Monday (Feb. 4) at 8 p.m. EST on NBC.