Tim Wigmore, sports journalist for The Telegraph and co-author of The Best: How Elite Athletes are Made, joins Thirty Love host Carl Bialik to apply his sports-science insights to tennis: why younger siblings thrive in tennis and other sports, how Andre Agassi figured out how to beat Boris Becker, and how the pandemic upended 2020 for athletes and the people who write about them. Have feedback, a suggestion for a Thirty Love guest, or anything else you want to say? Email Carl at bialik@pm.me Music by Lee Rosevere: "Credit Roll" and "Glass Android."