The Boston Red Sox last won the World Series in 2018, and the current prediction market prices their chances of winning the 2026 championship at 3 percent. This low probability reflects the competitive intensity required to win baseball's premier title—a World Series championship demands sustained excellence across a 162-game regular season, a grueling multi-round playoff structure, and finally a seven-game series against the opposing league champion. At these odds, the market is pricing the Red Sox as significant underdogs relative to other contenders. The market remains open through October 31, 2026, allowing traders to adjust positions as the regular season unfolds and teams' actual roster strength, injuries, and performance trajectories become clearer. Price movements in the market typically track real-world events such as mid-season trades, key player injuries, division standings, and perceived strength of rival teams. Traders participate in these prediction markets to evaluate championship probabilities across all thirty MLB franchises.