RESEARCH: Does crossing leagues affect hitters?

The yet-to-be-official blockbuster deal between the Toronto Blue Jays and the Miami Marlins has fantasy owners wondering about how much better—or worse—the batters involved will fare now that they are changing leagues. Fantasy owners wonder how to allow for José Reyes and Emilio Bonifácio now that they’re in the “stronger league.”

But is the AL the stronger league, as many fans believe, especially where individual player performance is concerned? And should fantasy owners aggressively attempt to acquire hitters moving from the AL to the NL in anticipation of improved performance?

We’ve all heard general statements about the differences between the AL and the NL. “The AL has smaller ballparks, resulting in more HRs,” some people...

Almost!

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