Taylor Swift’s “Patient Zero” holds overwhelming 99.6% market-implied odds for Billboard Hot 100 No. 1 the week of October 10 because of its blockbuster Sept. 25 debut on The Life of a Showgirl: The Encore. The track posted the year’s strongest first-day Spotify numbers for a female artist, debuted at No. 1 on the UK Official Singles Chart, and benefited from a high-profile VMA video premiere plus heavy Swiftie streaming and sales mobilization. Multiple encore cuts also landed in the UK top five, reinforcing the campaign’s momentum. An upset would require another release—such as Ariana Grande’s “Hate That I Made You Love Me” or a surprise Morgan Wallen or Ella Langley surge—to post unprecedented multi-metric gains during the tracking window, an outcome the current data and historical patterns make highly improbable.