For the first time in baseball history, there would be a double playoff. New York and Boston would play Monday at Yankee Stadium to decide the AL East winner. The loser would play the Indians on Tuesday for the wild card -- it would either be New York at Cleveland or the Indians at Boston.
-- If the Yankees and Red Sox finish tied, with better records than the Indians: Both New York and Boston make the playoffs, the Indians are out. Because both the Yankees and Red Sox would be assured spots, then the head-to-head record comes into play; in this case, the Yankees would have a better record vs. Boston and be the AL East champion and the Red Sox would win the wild card.
-- If the Yankees and Red Sox finish tied, with a worse record than the Indians:
Boston and New York hold a one-game playoff at Yankee Stadium on Monday to decide the AL East winner, Cleveland win the wild card.
-- If the Yankees win the AL East and Boston and Cleveland finish tied:
The Indians play at Fenway Park on Monday in a one-game playoff for the wild card.
-- If the Red Sox win the AL East and the Yankees and Cleveland finish tied:
The Yankees play at Jacobs Field on Monday in a one-game playoff for the wild card.