Taylor Swift’s “Patient Zero,” released September 25 as part of the expanded The Life of a Showgirl: The Encore, drives the 99.5% market-implied odds through record-breaking first-week streams, including the biggest single-day total for a female artist on Spotify in 2026, plus immediate No. 1 debuts on UK singles charts, iTunes, and Apple Music. The track’s strong sales, video premiere at the 2026 MTV VMAs, and Taylor’s ongoing chart dominance create a clear frontrunner for the Billboard Hot 100 dated around October 10. Traders appear to view the data as decisive. An upset would require unusually steep drops in streams or sales during final tracking or an unforeseen surge from competing releases, though historical patterns and current metrics make that outcome remote.