The game will be played only if the Mets and Phillies are tied for the division lead and the NL Wild Card team comes from the Central or West division. If the Mets and Phillies tie for first place and have better records than the runners-up in the other divisions, the Mets will be the East champions based on their 11-7 record in head-to-head competition against the Phillies. No one-game playoff would happen in that case.
The Mets lost the coin flip to the Phillies last season, too, but no game was necessary because Philadelphia won the division championship outright.
The Mets lost the coin flip in 1999 as well and had to play the Reds in a one-game playoff in Cincinnati. They won that game, 5-0, to advance to NLDS against the Diamondbacks.
An extra game to determine a division championship or a Wild Card berth is not considered a postseason game. Such games are regular-season games, and all performances in them apply only to regular-season statistics.
Marty Noble is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.