Boston Red Sox vs. New York Yankees: Tied after 5 innings?

The market resolves on whether the Boston Red Sox vs New York Yankees game is tied after five innings. This is a first-half market, driven by starting pitchers and early offense rather than bullpens and late-game management. The current price of 0.190 (19%) versus our 0.340 (34%) estimate gives a 15.0 percentage point edge.

The key driver is the structural frequency of ties after five innings. In MLB, a tie after five is common: both starters are usually strong, and bullpens, where meltdowns cluster, do not enter the picture in that window. Historically, the league-wide rate of ties after five innings sits around 25-35%, and in matchups between evenly matched teams with quality starters it trends toward the upper end. Red Sox and Yankees are fierce rivals with comparable lineups, which raises the chance of a scoreless or level game.

For Yes to win, the teams simply need to be level at the end of the fifth, including 0:0. At 0.190 the market appears to assign too high a probability to one side grabbing an early lead, while MLB base rates point to a higher tie frequency.

The main risk is an early offensive burst: if one starter allows several runs in the first two innings, a tie becomes unlikely. Roster changes or pitcher injuries also matter. The idea is invalidated by a starting pitcher announcement showing poor form against a strong opposing lineup.