We mustache you a question: Is Jake Arrieta's beard the only thing better than his curveball?
Bold Predictions: Arrieta, Darvish, Cobb Landing Spots - CHICAGO style SPORTS
Chicago Cubs ace Jake Arrieta talks mindsets, workouts and winning a World Series -- Body Issue 2016 - ESPN
Wrigleyville - Baseball Prospectus
Jake Arrieta - AZ Snake Pit
Major League Beards: Best Beards For Every Position in Pro Baseball - Grooming Lounge
Jake Arrieta, Major League Baseball, News, Scores, Highlights, Stats, and Rumors
Jake Arrieta, Major League Baseball, News, Scores, Highlights, Stats, and Rumors
Cubs' Jake Arrieta: Lose the NLCS? Lose the Beard
The Myth of the Magic Sports Beard - The New York Times