It seems that Roger Federer is serious about starting a boy band, tweeting "No seriously, we're actually starting a boy band." He joined Tommy Haas and Grigor Dimitrov (with David Foster on piano) for a second installment of Chicago’s “Hard to Say I’m Sorry.”

Their latest performance included a lot of improvements from their first show in January, including doing away with cell phone lyrics, harmonizing perfectly, adding some professional sound enhancements, and throwing in surprise guest Novak Djokovic.

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Federer, Dimitrov and Haas sing a showstopper again

The men sounded noticeably better than their first performance, proving practice (and teamwork) makes perfect. Who knows what’s in store next for the One-Handed Backhand Boys, but the world can't wait to find out.