Who was Jake Arrieta calling out on Twitter?

Other than his showy mustache onesie, Jake Arrieta is a fairly conservative guy. So, it was a bit surprising when the Cubs pitcher—fresh off his no-hitter on Sunday—took to Twitter on Tuesday and fired a curveball that left everyone guessing.

Arrieta’s cryptic subtweet instantly had the Twitterverse chirping. Who was he targeting?

Some guesses:

Starlin Castro

James Russell, Rafael Soriano

Chris Denorfia

Nope. Nope. And, Nope.

As it turns out, Arrieta’s tweet was directed at … a fan.

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