MLB Jersey Numbers on X: The #Mets announce that number 36 will be retired for LHP Jerry Koosman in 2020. Manager Mickey Callaway switches from number 36 to number 26. Last worn
Mets News: Mets to retire Jerry Koosman's number 36 in 2020. - Amazin' Avenue
Mets retiring No. 36 of ex-pitcher Koosman in '20 - ESPN
NY Mets honor legend Jerry Koosman by retiring No. 36 jersey
Mets randomly announced they will retire Jerry Koosman's number 36 - The Mets Police