Tumaini Carayol, a sportswriter for The Guardian, rejoins Thirty Love host Carl Bialik from the US Open to talk about Serena Williams's candor after her fourth-round win, Coco Gauff's precociousness and penchant for doubles, and the young men's stars' heel turns.

Have a suggestion for a Thirty Love guest, during the US Open or beyond? Email Carl at [email protected]

Music by Lee Rosevere: "Credit Roll" and "Glass Android."