Answer: mrmet

AnswerCrossword Clue
MRMETMascot in a number of Sportscenter ads
MRMETMascot at Shea
MRMETMascot at Citi Field
MRMETBig Apple baseball mascot
MRMETShea Stadium mascot
MRMETCiti Field mascot
MRMETHis head is a large baseball
MRMETShea mascot
MRMETBig-headed major-league mascot
MRMETSports mascot who's a popular bobblehead figure
MRMETRival mascot of the Phillie Phanatic
MRMETCiti Field icon