Longtime tennis coach Nick Bollettieri, who has coached 10 players who have reached world No. 1 in singles, joins host Carl Bialik from the New York Open to talk about "Love Means Zero," the new documentary about his life; Roger Federer's return to No. 1; and why the best coaches speak differently to every player.

Produced and edited by Jorge Estrada, with music by Lee Rosevere.

Clip of "Love Means Zero": http://www.sho.com/video/58002/love-means-zero-clip