The blog Tiger Tales recently studied whether or not a team has a higher success rate than normal in the game following a walk-off win. He came to the conclusion that overall, there is not a significant statistical difference in performance in the following game. So I went through my database and compiled how the Mets did in the game following a walk-off win, disqualifying games that marked the completion of a season or were ties (1 instance of a tie). With Friday's win, the Mets improved to 182-169 in games that followed a walk-off win (including postseason). That's a win percentage of .519. Tiger Tales suggests that you compare that to the team's home win percentage, since in an overwhelming number of instances, your next game following a walk-off win is at home (not 100% sure of that, but seems like a reasonable premise). The Mets overall home win percentage, including postseason, is .514 by my computations. So statistically speaking, it looks like there is no impact. I
A blog devoted to cataloguing New York Mets walk-offs and other trivia. For those unaware of the definition of walk-off just replace the term with the words "game-ending" and you should have a much better understanding of the phrase.