Seattle Mariners First-Place Eliminiation Scenario
Seattle must win 15 more games (43 total) to avoid elimination from first place.
Here are the final standings in a scenario in which Seattle finishes in first place with 43 wins:

Team             W	L	PCT	GB
Seattle          43	119	0.265	0.00
Los Angeles      43	119	0.265	0.00
Texas            43	119	0.265	0.00
Houston          43	119	0.265	0.00
Oakland          43	119	0.265	0.00

Tie breakers
Seattle wins the series with Houston 7 games to 6
Seattle wins the series with Los Angeles 7 games to 6
Seattle wins the series with Oakland 7 games to 6
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
Seattle          28	21	113	0.571	0.0
Houston          26	24	112	0.520	2.5
Texas            25	26	111	0.490	4.0
Los Angeles      24	25	113	0.490	4.0
Oakland          22	29	111	0.431	7.0

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

Houston currently has 2 win(s) against Los Angeles and 1 loss(es).
Houston wins 4 additional game(s) against Los Angeles and loses 6.
Houston loses the series 6 games to 7.
Houston wins 0 additional game(s) against teams outside the division and loses 71.

Houston currently has 0 win(s) against Oakland and 0 loss(es).
Houston wins 0 additional game(s) against Oakland and loses 13.
Houston loses the series 0 games to 13.
Houston wins 0 additional game(s) against teams outside the division and loses 71.

Houston currently has 2 win(s) against Seattle and 2 loss(es).
Houston wins 4 additional game(s) against Seattle and loses 5.
Houston loses the series 6 games to 7.
Houston wins 0 additional game(s) against teams outside the division and loses 71.

Houston currently has 2 win(s) against Texas and 2 loss(es).
Houston wins 9 additional game(s) against Texas and loses 0.
Houston wins the series 11 games to 2.
Houston wins 0 additional game(s) against teams outside the division and loses 71.

Los Angeles currently has 4 win(s) against Oakland and 0 loss(es).
Los Angeles wins 4 additional game(s) against Oakland and loses 5.
Los Angeles wins the series 8 games to 5.
Los Angeles wins 0 additional game(s) against teams outside the division and loses 73.

Los Angeles currently has 0 win(s) against Seattle and 2 loss(es).
Los Angeles wins 6 additional game(s) against Seattle and loses 5.
Los Angeles loses the series 6 games to 7.
Los Angeles wins 0 additional game(s) against teams outside the division and loses 73.

Los Angeles currently has 0 win(s) against Texas and 3 loss(es).
Los Angeles wins 3 additional game(s) against Texas and loses 7.
Los Angeles loses the series 3 games to 10.
Los Angeles wins 0 additional game(s) against teams outside the division and loses 73.

Oakland currently has 3 win(s) against Seattle and 4 loss(es).
Oakland wins 3 additional game(s) against Seattle and loses 3.
Oakland loses the series 6 games to 7.
Oakland wins 0 additional game(s) against teams outside the division and loses 77.

Oakland currently has 5 win(s) against Texas and 2 loss(es).
Oakland wins 0 additional game(s) against Texas and loses 6.
Oakland loses the series 5 games to 8.
Oakland wins 0 additional game(s) against teams outside the division and loses 77.

Seattle currently has 5 win(s) against Texas and 1 loss(es).
Seattle wins 2 additional game(s) against Texas and loses 5.
Seattle wins the series 7 games to 6.
Seattle wins 0 additional game(s) against teams outside the division and loses 80.

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