Atlanta Braves First-Place Eliminiation Scenario
Atlanta must win 19 more games (61 total) to avoid elimination from first place.
Here are the final standings in a scenario in which Atlanta finishes in first place with 61 wins:

Team             W	L	PCT	GB
Atlanta          61	101	0.377	0.00
Philadelphia     61	101	0.377	0.00
Washington       59	103	0.364	2.00
Miami            59	103	0.364	2.00
New York         59	103	0.364	2.00

Tie breakers
Atlanta wins the series with Philadelphia 8 games to 5

To construct the scenario, we start with the current standings in the division:
Team             W	L	GL	PCT	GB
Philadelphia     55	41	66	0.573	0.0
New York         55	42	65	0.567	0.5
Miami            44	51	67	0.463	10.5
Atlanta          42	53	67	0.442	12.5
Washington       38	58	66	0.396	17.0

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

Atlanta currently has 2 win(s) against Miami and 3 loss(es).
Atlanta wins 5 additional game(s) against Miami and loses 3.
Atlanta wins the series 7 games to 6.
Atlanta wins 0 additional game(s) against teams outside the division and loses 42.

Atlanta currently has 5 win(s) against New York and 2 loss(es).
Atlanta wins 5 additional game(s) against New York and loses 1.
Atlanta wins the series 10 games to 3.
Atlanta wins 0 additional game(s) against teams outside the division and loses 42.

Atlanta currently has 4 win(s) against Philadelphia and 5 loss(es).
Atlanta wins 4 additional game(s) against Philadelphia and loses 0.
Atlanta wins the series 8 games to 5.
Atlanta wins 0 additional game(s) against teams outside the division and loses 42.

Atlanta currently has 3 win(s) against Washington and 3 loss(es).
Atlanta wins 5 additional game(s) against Washington and loses 2.
Atlanta wins the series 8 games to 5.
Atlanta wins 0 additional game(s) against teams outside the division and loses 42.

Miami currently has 2 win(s) against New York and 4 loss(es).
Miami wins 5 additional game(s) against New York and loses 2.
Miami wins the series 7 games to 6.
Miami wins 0 additional game(s) against teams outside the division and loses 39.

Miami currently has 2 win(s) against Philadelphia and 5 loss(es).
Miami wins 6 additional game(s) against Philadelphia and loses 0.
Miami wins the series 8 games to 5.
Miami wins 0 additional game(s) against teams outside the division and loses 39.

Miami currently has 5 win(s) against Washington and 1 loss(es).
Miami wins 1 additional game(s) against Washington and loses 6.
Miami loses the series 6 games to 7.
Miami wins 0 additional game(s) against teams outside the division and loses 39.

New York currently has 4 win(s) against Philadelphia and 2 loss(es).
New York wins 1 additional game(s) against Philadelphia and loses 6.
New York loses the series 5 games to 8.
New York wins 0 additional game(s) against teams outside the division and loses 39.

New York currently has 5 win(s) against Washington and 2 loss(es).
New York wins 0 additional game(s) against Washington and loses 6.
New York loses the series 5 games to 8.
New York wins 0 additional game(s) against teams outside the division and loses 39.

Philadelphia currently has 4 win(s) against Washington and 2 loss(es).
Philadelphia wins 0 additional game(s) against Washington and loses 7.
Philadelphia loses the series 4 games to 9.
Philadelphia wins 0 additional game(s) against teams outside the division and loses 42.

# Atlanta Braves' magic number
# Atlanta's magic number
# Braves' magic number
# MLB Playoff Race