Former doubles world No. 1 Max Mirnyi, age 40, joins Thirty Love host Carl Bialik from the New York Open to talk about Roger Federer's return to world No. 1 in singles and what it was like playing doubles with, and splitting up with, Federer; Mirnyi's favorite partner (they only played one tournament together, losing in the final) and the partner who got away; and how rules changes have made it possible for doubles stars to excel into their 40s. Produced and edited by Jorge Estrada, with music by Lee Rosevere. Mirnyi on Instagram: https://www.instagram.com/maxmirnyi/