Phil Mickelson's top 10 neighbors form a tightly compressed, single-sport cluster — scores run from 0.98 down to 0.97 with no standout gap, and every entity in the set is golf.
The shape is flat: similarity scores measure how closely two audiences resemble each other in composition, and here the top 10 span just 0.016 points, from Jordan Spieth at 0.98 down to Jason Day at 0.97. Seven of the ten neighbors are fellow Athletes: Spieth (0.98), Rory McIlroy (0.98), Max Homa (0.98), Brooks Koepka (0.97), Justin Thomas (0.97), Dustin Johnson (0.97), and Day (0.97). The remaining three are golf institutions rather than players: PGA Tour (0.98) as a Sports League, The Masters (0.97) as a Sporting Event, and David Feherty (0.97) as a TV Personality. No golf equipment brands, media channels, or non-golf entities appear in the top 10 — the cluster is entirely players and the organizational infrastructure of the tour.
What this reveals is an audience defined almost entirely by the sport itself: the people who follow Mickelson overlap almost interchangeably with those who follow the tour's other active and prominent players, its flagship events, and its primary broadcast voice — a self-contained golf ecosystem with no meaningful crossover into adjacent sports or entertainment in the top 10.