Why Is Marcos Mateo in the Big Leagues Right Now?

In light of my recent obsession with Cubs rookie pitchers, I’ve taken notice to yet another intriguing young arm. Marcos Mateo made his big league debut Aug. 8, and has enjoyed little to no success since then.

Mateo joined the Cubs’ system as a player to be named later in the trade that sent outfielder Buck Coats (remember him?) to Cincinnati in 2007. While the Cubs tried their hand at making Mateo a starter, it is clear his control issues limit him to a relief role.

The 26-year-old right-hander has shared time in the Cubs’ Rookie, Double-A, and Triple-A leagues this season before joining the Cubs&rsq...

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