Seattle Mariners First-Place Eliminiation Scenario
Seattle must win 12 more games (61 total) to avoid elimination from first place.
Here are the final standings in a scenario in which Seattle finishes in first place with 61 wins:

Team             W	L	PCT	GB
Seattle          61	101	0.377	0.00
Texas            61	101	0.377	0.00
Los Angeles      60	102	0.370	1.00
Oakland          59	103	0.364	2.00
Houston          59	103	0.364	2.00

Tie breakers
Seattle wins the series with Texas 7 games to 6

To construct the scenario, we start with the current standings in the division:
Team             W	L	GL	PCT	GB
Houston          55	39	68	0.585	0.0
Seattle          49	45	68	0.521	6.0
Texas            47	48	67	0.495	8.5
Los Angeles      46	48	68	0.489	9.0
Oakland          39	57	66	0.406	17.0

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 4 additional game(s) against Los Angeles and loses 3.
Houston wins the series 8 games to 5.
Houston wins 0 additional game(s) against teams outside the division and loses 40.

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 0 additional game(s) against teams outside the division and loses 40.

Houston currently has 4 win(s) against Seattle and 3 loss(es).
Houston wins 0 additional game(s) against Seattle and loses 6.
Houston loses the series 4 games to 9.
Houston wins 0 additional game(s) against teams outside the division and loses 40.

Houston currently has 2 win(s) against Texas and 3 loss(es).
Houston wins 0 additional game(s) against Texas and loses 8.
Houston loses the series 2 games to 11.
Houston wins 0 additional game(s) against teams outside the division and loses 40.

Los Angeles currently has 7 win(s) against Oakland and 0 loss(es).
Los Angeles wins 2 additional game(s) against Oakland and loses 4.
Los Angeles wins the series 9 games to 4.
Los Angeles wins 0 additional game(s) against teams outside the division and loses 41.

Los Angeles currently has 2 win(s) against Seattle and 3 loss(es).
Los Angeles wins 4 additional game(s) against Seattle and loses 4.
Los Angeles loses the series 6 games to 7.
Los Angeles wins 0 additional game(s) against teams outside the division and loses 41.

Los Angeles currently has 2 win(s) against Texas and 5 loss(es).
Los Angeles wins 5 additional game(s) against Texas and loses 1.
Los Angeles wins the series 7 games to 6.
Los Angeles wins 0 additional game(s) against teams outside the division and loses 41.

Oakland currently has 3 win(s) against Seattle and 4 loss(es).
Oakland wins 4 additional game(s) against Seattle and loses 2.
Oakland wins the series 7 games to 6.
Oakland wins 0 additional game(s) against teams outside the division and loses 41.

Oakland currently has 5 win(s) against Texas and 2 loss(es).
Oakland wins 5 additional game(s) against Texas and loses 1.
Oakland wins the series 10 games to 3.
Oakland wins 0 additional game(s) against teams outside the division and loses 41.

Seattle currently has 7 win(s) against Texas and 2 loss(es).
Seattle wins 0 additional game(s) against Texas and loses 4.
Seattle wins the series 7 games to 6.
Seattle wins 0 additional game(s) against teams outside the division and loses 44.

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