Spider-Man: Brand New Day holds a narrow edge in trader sentiment for the second-biggest 2026 opening weekend, with its 53.5% implied probability reflecting strong pre-release tracking, established fan loyalty, and Marvel's proven theatrical draw. Avengers: Doomsday trails at 47%, creating a closely contested matchup driven by overlapping release windows and comparable marketing momentum. A wide field of other titles clustered near 50% underscores uncertainty around final box office estimates, as audience scores, competition from fellow blockbusters, and late shifts in social buzz could still reorder the ranking. Lower probabilities for Toy Story 5, Dune: Messiah, and The Hunger Games: Sunrise on the Reaping highlight their narrower appeal or earlier positioning relative to peak summer releases.