If the three Clubs are tied after Sunday's games, then the tie will be broken using the following system. Since the three Clubs each won one season series and lost one season series against each other in head-to-head competition in the regular season, MLB will use a system of designations – as Club A, Club B or Club C – based on their combined winning percentages in head-to-head competition against one another in the regular season.
Club A would host Club B on Monday, with the winner earning a Wild Card. The loser of Monday's game would then play at Club C on Tuesday, with Tuesday's winner earning the other Wild Card. Home-field advantage in Wednesday's A.L. Wild Card Game would be determined by the head-to-head record between the two Clubs that earned the Wild Card berths.
This would be awesome.