**Kylie Jenner and Ben Stiller lead Polymarket probabilities for US Open Finals attendance**, reflecting their recent high-profile appearances at New York sports events, including the 2026 NBA Finals at Madison Square Garden. As New York-based or frequent visitors with strong social media followings, these celebrities align with patterns of star power at Flushing Meadows, where past attendees like Spike Lee, Anna Wintour, and Simone Biles have drawn consistent attention. The Grand Slam's timing in late August and early September, combined with Arthur Ashe Stadium's celebrity sections, amplifies visibility for actors, influencers, and athletes. Upcoming schedule factors such as confirmed travel, public statements, or social media activity in the coming weeks could shift implied probabilities, while the event's prestige and New York location continue to favor regular or high-visibility attendees over one-off visitors. Uncertainty remains around last-minute changes typical in celebrity schedules.