"Because of the Jays win [yesterday], combined with Seattle and Houston’s losses, Jays just need to get to 90 wins to clinch a postseason berth, so our Magic Number is 3. Because of Seattle’s remaining games against Houston and Texas, it is possible that Seattle could go 90-72 while Houston goes 89-73. In this instance the Jays would clinch with 89 wins due to holding a tiebreaker over Houston. However, it’s also possible for Houston to go 90-72 while Seattle goes 89-73. In this instance the Jays would not make the playoffs due to Seattle holding the tiebreaker.
That is why, as of right now, 90 wins guarantees Toronto a postseason berth" - BlueJays MagicNumber