Ben Rice holds a narrow edge in the MLB postseason RBI leader market at 54.3% implied probability, driven by his 9 RBIs and 4 home runs across five early playoff games for the Yankees, including a six-RBI outburst in the AL Wild Card series. The race remains tightly bunched among dozens of outcomes near 50% because deep runs by the Brewers and Rays have distributed RBI opportunities across players like Jackson Chourio, William Contreras, Jose Ramirez, and Yandy Diaz, who each sit at or near eight RBIs through additional games. Ongoing World Series matchups, varying at-bats, and the potential for late surges in a best-of-seven series keep the field competitive without a clear runaway leader.