Seattle Mariners First-Place Eliminiation Scenario
Seattle must win 13 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
Texas            60	102	0.370	0.00
Los Angeles      58	104	0.358	2.00
Oakland          58	104	0.358	2.00
Houston          58	104	0.358	2.00

Tie breakers
Seattle wins the series with Texas 11 games to 2

To construct the scenario, we start with the current standings in the division:
Team             W	L	GL	PCT	GB
Houston          54	35	73	0.607	0.0
Seattle          47	42	73	0.528	7.0
Texas            44	45	73	0.494	10.0
Los Angeles      43	45	74	0.489	10.5
Oakland          37	54	71	0.407	18.0

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 0 additional game(s) against teams outside the division and loses 44.

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 44.

Houston currently has 4 win(s) against Seattle and 3 loss(es).
Houston wins 1 additional game(s) against Seattle and loses 5.
Houston loses the series 5 games to 8.
Houston wins 0 additional game(s) against teams outside the division and loses 44.

Houston currently has 2 win(s) against Texas and 2 loss(es).
Houston wins 3 additional game(s) against Texas and loses 6.
Houston loses the series 5 games to 8.
Houston wins 0 additional game(s) against teams outside the division and loses 44.

Los Angeles currently has 7 win(s) against Oakland and 0 loss(es).
Los Angeles wins 3 additional game(s) against Oakland and loses 3.
Los Angeles wins the series 10 games to 3.
Los Angeles wins 0 additional game(s) against teams outside the division and loses 43.

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 43.

Los Angeles currently has 0 win(s) against Texas and 3 loss(es).
Los Angeles wins 1 additional game(s) against Texas and loses 9.
Los Angeles loses the series 1 games to 12.
Los Angeles wins 0 additional game(s) against teams outside the division and loses 43.

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 46.

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 46.

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 49.

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