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."
[PAVLOVIC: The Giants Insider Podcast: Episode 3 with Matt Duffy]
In the cartoon, Duffman is the spokesperson for the local brewing company, Duff Beer.