Jeff McFarland, a Jacksonville lawyer who writes about tennis and tennis analytics at his Tumblr called First Ball In, joins Thirty Love host Carl Bialik to talk about Novak Djokovic's triumphant return, Angelique Kerber's first Wimbledon title, and how he calculates Popcorn Scores to identify must-watch matches. Produced and edited by Jorge Estrada, with music by Lee Rosevere. First Ball In: http://fbitennis.tumblr.com/ McFarland on Twitter: https://twitter.com/FBITennis