San Francisco Giants First-Place Eliminiation Scenario
San Francisco must win 16 more games (45 total) to avoid elimination from first place.
Here are the final standings in a scenario in which San Francisco finishes in first place with 45 wins:

Team             W	L	PCT	GB
San Francisco    45	117	0.278	0.00
Arizona          45	117	0.278	0.00
San Diego        45	117	0.278	0.00
Colorado         44	118	0.272	1.00
Los Angeles      44	118	0.272	1.00

Tie breakers
San Francisco wins the series with Arizona 7 games to 6
San Francisco wins the series with San Diego 7 games to 6

To construct the scenario, we start with the current standings in the division:
Team             W	L	GL	PCT	GB
Los Angeles      31	19	112	0.620	0.0
San Francisco    29	21	112	0.580	2.0
San Diego        27	21	114	0.562	3.0
Arizona          26	24	112	0.520	5.0
Colorado         8	42	112	0.160	23.0

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

Arizona currently has 2 win(s) against Colorado and 1 loss(es).
Arizona wins 0 additional game(s) against Colorado and loses 10.
Arizona loses the series 2 games to 11.
Arizona wins 0 additional game(s) against teams outside the division and loses 73.

Arizona currently has 3 win(s) against Los Angeles and 4 loss(es).
Arizona wins 4 additional game(s) against Los Angeles and loses 2.
Arizona wins the series 7 games to 6.
Arizona wins 0 additional game(s) against teams outside the division and loses 73.

Arizona currently has 0 win(s) against San Diego and 0 loss(es).
Arizona wins 11 additional game(s) against San Diego and loses 2.
Arizona wins the series 11 games to 2.
Arizona wins 0 additional game(s) against teams outside the division and loses 73.

Arizona currently has 2 win(s) against San Francisco and 1 loss(es).
Arizona wins 4 additional game(s) against San Francisco and loses 6.
Arizona loses the series 6 games to 7.
Arizona wins 0 additional game(s) against teams outside the division and loses 73.

Colorado currently has 0 win(s) against Los Angeles and 3 loss(es).
Colorado wins 10 additional game(s) against Los Angeles and loses 0.
Colorado wins the series 10 games to 3.
Colorado wins 0 additional game(s) against teams outside the division and loses 76.

Colorado currently has 1 win(s) against San Diego and 5 loss(es).
Colorado wins 7 additional game(s) against San Diego and loses 0.
Colorado wins the series 8 games to 5.
Colorado wins 0 additional game(s) against teams outside the division and loses 76.

Colorado currently has 1 win(s) against San Francisco and 3 loss(es).
Colorado wins 9 additional game(s) against San Francisco and loses 0.
Colorado wins the series 10 games to 3.
Colorado wins 0 additional game(s) against teams outside the division and loses 76.

Los Angeles currently has 0 win(s) against San Diego and 0 loss(es).
Los Angeles wins 1 additional game(s) against San Diego and loses 12.
Los Angeles loses the series 1 games to 12.
Los Angeles wins 0 additional game(s) against teams outside the division and loses 70.

Los Angeles currently has 0 win(s) against San Francisco and 0 loss(es).
Los Angeles wins 10 additional game(s) against San Francisco 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 70.

San Diego currently has 2 win(s) against San Francisco and 0 loss(es).
San Diego wins 4 additional game(s) against San Francisco and loses 7.
San Diego loses the series 6 games to 7.
San Diego wins 0 additional game(s) against teams outside the division and loses 70.

# San Francisco Giants' magic number
# San Francisco's magic number
# Giants' magic number
# MLB Playoff Race