Seattle Mariners First-Place Eliminiation Scenario
Seattle must win 12 more games (60 total) to avoid elimination from first place.
Here are the final standings in a scenario in which Seattle finishes in first place with 60 wins:

Team             W	L	PCT	GB
Seattle          60	102	0.370	0.00
Los Angeles      60	102	0.370	0.00
Oakland          59	103	0.364	1.00
Texas            59	103	0.364	1.00
Houston          59	103	0.364	1.00

Tie breakers
Seattle wins the series with Los Angeles 8 games to 5

To construct the scenario, we start with the current standings in the division:
Team             W	L	GL	PCT	GB
Houston          55	35	72	0.611	0.0
Seattle          48	42	72	0.533	7.0
Texas            44	46	72	0.489	11.0
Los Angeles      43	46	73	0.483	11.5
Oakland          37	55	70	0.402	19.0

Next, we show how the remaining series of games plays out in the scenario:

Houston currently has 4 win(s) against Los Angeles and 2 loss(es).
Houston wins 0 additional game(s) against Los Angeles and loses 7.
Houston loses the series 4 games to 9.
Houston wins 1 additional game(s) against teams outside the division and loses 42.

Houston currently has 4 win(s) against Oakland and 2 loss(es).
Houston wins 0 additional game(s) against Oakland and loses 7.
Houston loses the series 4 games to 9.
Houston wins 1 additional game(s) against teams outside the division and loses 42.

Houston currently has 4 win(s) against Seattle and 3 loss(es).
Houston wins 3 additional game(s) against Seattle and loses 3.
Houston wins the series 7 games to 6.
Houston wins 1 additional game(s) against teams outside the division and loses 42.

Houston currently has 2 win(s) against Texas and 2 loss(es).
Houston wins 0 additional game(s) against Texas and loses 9.
Houston loses the series 2 games to 11.
Houston wins 1 additional game(s) against teams outside the division and loses 42.

Los Angeles currently has 7 win(s) against Oakland and 0 loss(es).
Los Angeles wins 0 additional game(s) against Oakland and loses 6.
Los Angeles wins the series 7 games to 6.
Los Angeles wins 0 additional game(s) against teams outside the division and loses 42.

Los Angeles currently has 2 win(s) against Seattle and 3 loss(es).
Los Angeles wins 3 additional game(s) against Seattle and loses 5.
Los Angeles loses the series 5 games to 8.
Los Angeles wins 0 additional game(s) against teams outside the division and loses 42.

Los Angeles currently has 0 win(s) against Texas and 3 loss(es).
Los Angeles wins 7 additional game(s) against Texas and loses 3.
Los Angeles wins the series 7 games to 6.
Los Angeles wins 0 additional game(s) against teams outside the division and loses 42.

Oakland currently has 3 win(s) against Seattle and 4 loss(es).
Oakland wins 6 additional game(s) against Seattle and loses 0.
Oakland wins the series 9 games to 4.
Oakland wins 0 additional game(s) against teams outside the division and loses 45.

Oakland currently has 5 win(s) against Texas and 2 loss(es).
Oakland wins 3 additional game(s) against Texas and loses 3.
Oakland wins the series 8 games to 5.
Oakland wins 0 additional game(s) against teams outside the division and loses 45.

Seattle currently has 7 win(s) against Texas and 2 loss(es).
Seattle wins 4 additional game(s) against Texas and loses 0.
Seattle wins the series 11 games to 2.
Seattle wins 0 additional game(s) against teams outside the division and loses 48.

# Seattle Mariners' magic number
# Seattle's magic number
# Mariners' magic number
# MLB Playoff Race