During Winter Meetings, teams were informed not to allow personalized decals on their players' bats, CSN Bay Area Giants insider Alex Pavlovic reported on Friday.
MLB's new rule will spell the end to Matt Duffy's signature "Duffman" decal, which received national attention during his rookie season and spring training last year.
"I watched The Simpsons growing up," Duffy told Amy Gutierrez of CSN Bay Area in a 2014 interview (video above). "I was actually almost gonna be Duffman for Halloween one year, but it was just a ton of work."
In the cartoon, Duffman is the spokesperson for the local brewing company, Duff Beer.
A few other Giants players also had their own decals last year, according to Pavlovic, who likened the MLB's ban to something the NFL -- nicknamed the "no fun league" for its strict measures on player celebrations and attire -- would do.
Teams were told at winter meetings that personalized bat decals can't be used. Giants had a few guys with them. That's some NFL-level stuff.— Alex Pavlovic (@AlexPavlovic) March 25, 2016