Roger Federer's "Imaginary Line Rule" + Running PLAYSDiscuss on Facebook Opens in a new window Wanna discuss this video? Head over to our Facebook Group and post about it there!You might also like: Martina Navratilova's favorite doubles tip for returning in the ad court About Federer's second match point against Djokovic at Wimbledon... Doubles Strategy | 1-Up, 1-Back Versus 2-Up Post navigation« Previous PostNext Post »