October disappointment ranks among MLB fanbases most affected by heartbreak

MLB fanbases have experienced varying degrees of heartbreak during October playoffs. The New York Yankees lead with the most postseason losses, totaling 191. Cincinnati Reds have not won a playoff series since 1995, suffering multiple collapses, including a significant one in 2012 and a recent sweep in 2025. The Seattle Mariners remain the only franchise without a pennant, adding to their longstanding frustrations. As the postseason progresses, several franchises are hoping for a breakthrough to alleviate years of disappointment.

• 11:59 AMYahoo Sports — All-time MLB October heartbreak rankings: 5 fanbases that have suffered most