Grammy Award-winning producer, 20-year music veteran and famed American Idol judge Randy Jackson sits down with former tennis pro, Justin Gimelstob for this week’s “World of Tennis presented by BNP Paribas.” The avid tennis player, who hits the courts 3 to 4 times a week, believes Roger Federer still has all the physical attributes to be No. 1 in the world and should reach out to former LA Lakers head coach Phil Jackson, the “Zen Master” to help work on his mental approach to the game. Jackson also believes that John McEnroe and the former unmercifully blunt American Idol judge Simon Cowell are surprisingly similar and might have been separated at birth. Other Gimelstob guests have included Maria Sharapova, John Isner and Mardy Fish. Catch the show Friday at 7:30 p.m. on Tennis Channel and again on Saturday at 12 noon on MSG Plus.