2017 Major League Equivalents

Each year, we post a complete listing of Major League Equivalent stats, as a research tool to draw out interesting performances from the minors in 2017. 

With some quick Excel sorting, you can quickly end up down the rabbit hole, exploring all kinds of interesting information. For instance, filter the batter file by HR and SB each > 15, as we all love a good power/speed combo. Three players bubble up: uber-prospect Ronald Acuna (OF, ATL), DJ Stewart (OF, BAL), and the very interesting Scott Kingery (2B, PHI). Acuna's not going to fly under anyone's radar, but Kingery's broad skill set and potential opportunity in Philadelphia make him a very interesting speculation.

With that, here are the full files for your explanation, and the complete explanation of the process behind them:

The Major League Equivalents (MLE) charts provide stats and sabermetric gauges for virtually all of 2017's Triple-A and Double-A batters and pitchers. Players are listed if they amassed at least 100 AB or 30 IP between both levels.


This is a model that was introduced by Bill James in his 1985 Baseball Abstract. He showed how minor league statistics could be converted to an equivalent major league level and how these MLEs were an accurate indicator of a player's future performance. (Note that MLEs are not projections; they represent what a player's minor league performance might look like at the major league level.) Because of wide variations in the level of play among different minor leagues, it is often difficult to get a true reading on a player's potential. For instance, a .300 batting average achieved in the high-offense Pacific Coast League is not nearly as much of an accomplishment as a similar level in the Eastern League. MLEs normalize these variances.

The model we use contains a few minor variations from James' version and updates all of the minor league and ballpark factors.

Be cognizant of each player's age and major league incumbents when evaluating them as prospects. As a rule of thumb, Double-A players will begin to lose their prospect luster if they're still at that level at age 23. Triple-A players begin to dim at 24.

Each player's actual AB/IP totals are used as the base for the conversion. However, it is often more useful to compare performances using common levels. For this purpose, we provide several sabermetric gauges. Complete explanations of these formulas appear in the Glossary.

Final 2017
  Batters | Pitchers

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  For more information about the terms used in this article, see our Glossary Primer.