10 Major League Baseball umpires retire in historic exodus

Scherzer roughed up by Astros in return from injury, leaving with Rangers down 5 in loss, Baseball

Gread McKinnis – Society for American Baseball Research

MLB Twitter reacts to mass retirement of major league umpires: Don't let the door hit you on the way out, Wish Angel Hernandez was on this list

Sources - 10 MLB umps retiring, most since '99 - ESPN

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Greg Gibson, The Home Plate Umpire, Retires After 25 Years of NL & MLB Baseball

MLB Rumors: Ted Barrett & Greg Gibson Among 10 Umpires Retiring

Mariners win finale vs. Astros in extras

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