The top 10 neighbors for Brooks Koepka form a tightly compressed band of golf-specific entities — scores run from 0.98 down to 0.95, with no single neighbor pulling sharply ahead of the rest. Similarity here measures how closely two entities' audiences resemble each other in composition; the narrow spread across all ten positions is the defining structural fact.

Seven of the ten neighbors are fellow Athletes: Rory McIlroy (0.98), Phil Mickelson (0.97), Justin Thomas (0.97), Max Homa (0.97), Jordan Spieth (0.97), Dustin Johnson (0.96), and Jason Day (0.96). The remaining three are golf infrastructure: PGA Tour (0.98) as a Sports League, The Masters (0.96) and no other Sporting Event in the top 10, and Golf Channel (0.95) as a TV Channel. Every single neighbor, regardless of subcategory, is a golf entity — there is no crossover into other sports, entertainment, or lifestyle categories within these ten positions.

The flat shape means Koepka's audience is not uniquely anchored to any one peer; it overlaps almost equally with the tour itself, its marquee events, its broadcast home, and a half-dozen fellow tour players. That uniformity points to an audience defined primarily by the sport rather than by anything distinctive about Koepka as an individual figure within it.