Oakland Athletics First-Place Clinch Scenario

Oakland's traditional magic number (relative to second-place Seattle) is 19 + 122 - 21 + 1 = 121.
Oakland's first-place clinch number is 119.
Oakland must win 119 more games (140 total) to clinch first place.

If Oakland wins 119 more games, their final win total will be at least 140.
The table below shows the best case scenario for each of the other teams if Oakland wins 119 of their remaining 123 games and loses the other 4.
For each team, the table shows the current record (number of wins (W) and losses (L)) and the number of games that team has
left to play (GL) in the regular season. Taking the schedule of games left to play into account, the 'Losses to Oakland' column gives the
minimum number of games that each team will lose to Oakland if Oakland wins 119 more games. Assuming that a team wins all of its remaining games except for
the games it loses to Oakland, the resulting maximum number of wins is shown in the 'Maximum W' column.

Team             W	L	GL	Losses to Oakland	Maximum W
Texas            18	21	123	       6 - 4 = 2	139
Seattle          19	21	122	      10 - 4 = 6	135
Houston          16	24	122	      10 - 4 = 6	132
Los Angeles      15	25	122	      13 - 4 = 9	128

The table above shows that if Oakland wins 119 more games (140 total), then they will finish the season in first place in the division.

To see that Oakland's first-place clinch number cannot be less than 119, consider the following scenario in which Oakland wins 118 more games (139 total) but does not finish in first place:

Team             W	L	PCT	GB
Texas            139	23	0.858	0.00
Oakland          139	23	0.858	0.00
Seattle          55	107	0.340	84.00
Houston          55	107	0.340	84.00
Los Angeles      47	115	0.290	92.00

Tie breakers
Texas wins the season series with Oakland 8 games to 5.

Seattle wins the season series with Houston 13 games to 0.

To construct the scenario, we start with the current standings in the division:
Team             W	L	GL	PCT	GB
Oakland          21	18	123	0.538	0.0
Seattle          19	21	122	0.475	2.5
Texas            18	21	123	0.462	3.0
Houston          16	24	122	0.400	5.5
Los Angeles      15	25	122	0.375	6.5

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


Houston currently has 2 wins against Los Angeles and 2 losses.
  Houston wins 5 additional games against Los Angeles and loses 4.
  Houston wins the series 7 games to 6

Los Angeles currently has 2 wins against Seattle and 1 losses.
  Los Angeles wins 5 additional games against Seattle and loses 5.
  Los Angeles wins the series 7 games to 6

Oakland currently has 2 wins against Houston and 1 losses.
  Oakland wins 10 additional games against Houston and loses 0.
  Oakland wins the series 12 games to 1

Oakland currently has 0 wins against Los Angeles and 0 losses.
  Oakland wins 13 additional games against Los Angeles and loses 0.
  Oakland wins the series 13 games to 0

Oakland currently has 2 wins against Seattle and 1 losses.
  Oakland wins 10 additional games against Seattle and loses 0.
  Oakland wins the series 12 games to 1

Seattle currently has 4 wins against Houston and 0 losses.
  Seattle wins 9 additional games against Houston and loses 0.
  Seattle wins the series 13 games to 0

Texas currently has 0 wins against Houston and 0 losses.
  Texas wins 13 additional games against Houston and loses 0.
  Texas wins the series 13 games to 0

Texas currently has 0 wins against Los Angeles and 0 losses.
  Texas wins 13 additional games against Los Angeles and loses 0.
  Texas wins the series 13 games to 0

Texas currently has 3 wins against Oakland and 4 losses.
  Texas wins 5 additional games against Oakland and loses 1.
  Texas wins the series 8 games to 5

Texas currently has 4 wins against Seattle and 2 losses.
  Texas wins 7 additional games against Seattle and loses 0.
  Texas wins the series 11 games to 2

Houston wins 34 games agains teams outside the division and loses 47.
Los Angeles wins 23 games agains teams outside the division and loses 54.
Oakland wins 84 games agains teams outside the division and loses 0.
Seattle wins 22 games agains teams outside the division and loses 64.
Texas wins 83 games agains teams outside the division and loses 1.

Combining the current standings with the wins and losses from the scenario results in the final standings listed above.
# Oakland Athletics' magic number
# Oakland's magic number
# Athletics' magic number
# MLB Playoff Race