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: Opponent crushing your serve? Aim here: If you're not familiar, that's Craig O'Shannessy in the video with me. He's leading the analytics revolution in tennis. If you liked his analysis and advice, then I'd like to […] How To Hold Serve 93% Of The Time Senior Doubles + Covering The Lob Post navigation« Previous PostNext Post »