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Tuesday, July 23, 2013

The NL West is mediocre: and yet is actually overperforming

The NL West is currently the weakest division in baseball, with the Dodgers leading the division with a record of 51-47, only 4 games above .500. The worst part about the current state of things in the West is that 4 of its 5 teams are actually overperforming their expected records. I've reached this conclusion based on the Pythagorean Expectation (originally derived by Bill James) for each team, calculated from their run differentials. If each team was playing to their expected winning percentage, the standings would currently look like this:

1.  Arizona Diamondbacks  50-49  .505 (+1)
T2. Colorado Rockies      50-50  .500 (-2)
T2. Los Angeles Dodgers   49-49  .500 (+2)
4.  San Francisco Giants  44-54  .449 (+1)
5.  San Diego Padres      43-57  .430 (+1)

As depicted above, the Rockies have underperformed by 2 wins, while each of the other 4 teams have slightly overperformed their expected records. As a whole, the division has won 3 more games than they should have, and still achieved their current level of mediocrity. If things had played out strictly by the numbers to date, the Diamondbacks would be in first place and primed for the lone playoff spot out of the division with a record 1 game over .500.

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