Justin Timberlake and Jimmy Fallon Do Beyonce's 'Single Ladies' Dance at the U.S. Open

Jimmy Fallon and Justin Timberlake's "History of Rap 6" - H 2015

The stars show off their spontaneous side during a changeover.

Justin Timberlake and Jimmy Fallon weren't just enjoying the game play at the U.S. Open on Wednesday night — they were into the music, too. 
The dynamic duo was caught on camera dancing along to Beyonce's "Single Ladies" during the changeover. And it's no surprise they knew the music video's choreography pretty darn well. 
Watch them below.