Miami Marlins First-Place Eliminiation Scenario
Miami must win 27 more games (27 total) to avoid elimination from first place.
Here are the final standings in a scenario in which Miami finishes in first place with 27 wins:

Team             W	L	PCT	GB
Miami            27	135	0.167	0.00
Philadelphia     27	135	0.167	0.00
Atlanta          27	135	0.167	0.00
New York         26	136	0.160	1.00
Washington       26	136	0.160	1.00

Tie breakers
Miami wins the series with Atlanta 12 games to 1
Miami wins the series with Philadelphia 11 games to 2

To construct the scenario, we start with the current standings in the division:
Team             W	L	GL	PCT	GB
Atlanta          1	0	161	1.000	0.0
New York         1	0	161	1.000	0.0
Miami            0	1	161	0.000	1.0
Philadelphia     0	1	161	0.000	1.0
Washington       0	1	161	0.000	1.0

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

Atlanta currently has 0 win(s) against Miami and 0 loss(es).
Atlanta wins 1 additional game(s) against Miami and loses 12.
Atlanta loses the series 1 games to 12.
Atlanta wins 0 additional game(s) against teams outside the division and loses 110.

Atlanta currently has 0 win(s) against New York and 0 loss(es).
Atlanta wins 12 additional game(s) against New York and loses 1.
Atlanta wins the series 12 games to 1.
Atlanta wins 0 additional game(s) against teams outside the division and loses 110.

Atlanta currently has 0 win(s) against Philadelphia and 0 loss(es).
Atlanta wins 1 additional game(s) against Philadelphia and loses 12.
Atlanta loses the series 1 games to 12.
Atlanta wins 0 additional game(s) against teams outside the division and loses 110.

Atlanta currently has 1 win(s) against Washington and 0 loss(es).
Atlanta wins 12 additional game(s) against Washington and loses 0.
Atlanta wins the series 13 games to 0.
Atlanta wins 0 additional game(s) against teams outside the division and loses 110.

Miami currently has 0 win(s) against New York and 1 loss(es).
Miami wins 1 additional game(s) against New York and loses 11.
Miami loses the series 1 games to 12.
Miami wins 0 additional game(s) against teams outside the division and loses 110.

Miami currently has 0 win(s) against Philadelphia and 0 loss(es).
Miami wins 11 additional game(s) against Philadelphia and loses 2.
Miami wins the series 11 games to 2.
Miami wins 0 additional game(s) against teams outside the division and loses 110.

Miami currently has 0 win(s) against Washington and 0 loss(es).
Miami wins 3 additional game(s) against Washington and loses 10.
Miami loses the series 3 games to 10.
Miami wins 0 additional game(s) against teams outside the division and loses 110.

New York currently has 0 win(s) against Philadelphia and 0 loss(es).
New York wins 0 additional game(s) against Philadelphia and loses 13.
New York loses the series 0 games to 13.
New York wins 3 additional game(s) against teams outside the division and loses 107.

New York currently has 0 win(s) against Washington and 0 loss(es).
New York wins 10 additional game(s) against Washington and loses 3.
New York wins the series 10 games to 3.
New York wins 3 additional game(s) against teams outside the division and loses 107.

Philadelphia currently has 0 win(s) against Washington and 0 loss(es).
Philadelphia wins 0 additional game(s) against Washington and loses 13.
Philadelphia loses the series 0 games to 13.
Philadelphia wins 0 additional game(s) against teams outside the division and loses 109.

# Miami Marlins' magic number
# Miami's magic number
# Marlins' magic number
# MLB Playoff Race