The Cleveland Guardians achieved the biggest comeback in baseball history by overcoming a 15.5-game deficit to take the lead in the AL Central division. Once considered unlikely with only a 0.2% chance of making the postseason on September 1, they have surged with an 18-5 record in September, significantly improving their playoff prospects. The Guardians' remarkable run includes a streak of allowing two or fewer runs in 19 consecutive games, the second-longest since the mound moved to its current height. They now hold a one-game lead over the Detroit Tigers, who have experienced an eight-game losing streak and a dramatic decline after leading the division for 155 days. Cleveland's victory was highlighted by strong pitching from Tanner Bibee and offensive contributions from George Valera and Jose Ramirez. The Guardians are poised to clinch a playoff spot as early as Thursday if the Houston Astros lose to the Athletics and they beat Detroit, with a chance to secure the division title with further wins. Meanwhile, Detroit faces a painful slide, emphasizing their need to find answers amid their losing streak. The Guardians' historic comeback has reshaped their postseason outlook, with a high probability of making the playoffs and winning the division, marking a significant achievement in baseball history.