Fallon and Timberlake liked it, so they did a jig to it.

The Tonight Show’s Jimmy Fallon and pop star Justin Timberlake brought sexy back to the U.S. Open in New York.

While the entertaining duo may have intended to have a relaxed evening watching tennis pros Rodger Federer and Richard Gasquet duke it out on the court, all bets were off when Beyoncé’s Single Ladies began to play.