Roger Federer, Grigor Dimitrov and Tommy Haas are starting a boy band, or so the world hopes. The trio performed Chicago's "Hard to Say I'm Sorry" and put on quite a show in Melbourne.

The men were accompanied by musician David Foster on the piano, who shared some creative names for the future band like 3Rackets and 1hand Backstroke Boys.

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Federer will have to put the virtual microphone down in exchange for a racquet soon enough when he takes on Kei Nishikori in the fourth round on Sunday. Dimitrov was a late Saturday night winner over Richard Gasquet to set up a clash with giant slayer Denis Istomin.