One of my favorite players of all time, Tom Glavine, got shelled in the first inning, and the Mets went on to lose to Florida, 8-1, while Philadelphia was beating Washington at home. 17 games ago, New York led Philadelphia by 7 games. Not only did they lose the division, they also lost out for the wild card. I'm sure glad I'm not a Mutt fan.
As far as I know, this is the biggest choke in baseball history. I have heard that one team in the 1930s may have blown a similar lead, but it took them a whole month.