Stella Lefty’s “Boston” commands a 92% implied probability for Billboard Hot 100 #2 the week of October 3 because of sustained streaming gains, strong radio adds, and consistent sales data that have locked in its position ahead of the tracking window. Traders view the track’s trajectory as difficult to overtake in the final weeks, especially given typical late-September chart patterns where frontrunners rarely lose ground absent a major promotional push. While an upset remains possible if a competitor like a new Taylor Swift single or Ella Langley track delivers an unexpected streaming spike or viral moment, historical data shows such reversals are rare once a song holds this level of multi-metric dominance entering the final tracking days.