Philadelphia Phillies First-Place Elimination Scenario
Philadelphia must win 0 more games (91 total) to avoid elimination from first place.
Here are the final standings in a scenario in which Philadelphia finishes in first place with 91 wins:

Team             W	L	PCT	GB
Philadelphia     91	71	0.562	0.00
New York         88	74	0.543	3.00
Atlanta          76	86	0.469	15.00
Miami            75	87	0.463	16.00
Washington       62	100	0.383	29.00

To construct the scenario, we start with the current standings in the division:
Team             W	L	GL	PCT	GB
Philadelphia     91	62	9	0.595	0.0
New York         78	74	10	0.513	12.5
Miami            72	80	10	0.474	18.5
Atlanta          70	83	9	0.458	21.0
Washington       62	91	9	0.405	29.0

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

Atlanta currently has 8 win(s) against Miami and 5 loss(es).
Atlanta and Miami have no remaining games.
Atlanta wins the series 8 games to 5.
Atlanta wins 3 additional game(s) against teams outside the division and loses 3.

Atlanta currently has 8 win(s) against New York and 5 loss(es).
Atlanta and New York have no remaining games.
Atlanta wins the series 8 games to 5.
Atlanta wins 3 additional game(s) against teams outside the division and loses 3.

Atlanta currently has 5 win(s) against Philadelphia and 8 loss(es).
Atlanta and Philadelphia have no remaining games.
Atlanta loses the series 5 games to 8.
Atlanta wins 3 additional game(s) against teams outside the division and loses 3.

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

Miami currently has 5 win(s) against New York and 5 loss(es).
Miami wins 0 additional game(s) against New York and loses 3.
Miami loses the series 5 games to 8.
Miami wins 0 additional game(s) against teams outside the division and loses 4.

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

Miami currently has 7 win(s) against Washington and 6 loss(es).
Miami and Washington have no remaining games.
Miami wins the series 7 games to 6.
Miami wins 0 additional game(s) against teams outside the division and loses 4.

New York currently has 7 win(s) against Philadelphia and 6 loss(es).
New York and Philadelphia have no remaining games.
New York wins the series 7 games to 6.
New York wins 4 additional game(s) against teams outside the division and loses 0.

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

Philadelphia currently has 8 win(s) against Washington and 5 loss(es).
Philadelphia and Washington have no remaining games.
Philadelphia wins the series 8 games to 5.
Philadelphia wins 0 additional game(s) against teams outside the division and loses 6.

# Philadelphia Phillies' magic number
# Philadelphia's magic number
# Phillies' magic number
# MLB Playoff Race