On the back of your card

Match the last three digits: 588. The rest of this code isn’t confirmed yet.

What it is
Base cards (#U-1 to U-300)
Confirmed by
Two independent sources

Base Set (300 cards)

#PlayerTeam
U-1Bo Bichette RC DebutToronto Blue Jays
U-2Adam EngelChicago White Sox
U-3Turner/Difo ComboWashington Nationals
U-4Mike Trout ASAngels
U-5Starlin CastroWashington Nationals
U-6Mike MoustakasCincinnati Reds
U-7Bregman/Alvarez ComboHouston Astros
U-8Buster Posey ASSan Francisco Giants
U-9Ken Griffey Jr. HR DerbySeattle Mariners
U-10Anthony AlfordToronto Blue Jays
U-11Chris OwingsColorado Rockies
U-12Aaron BummerChicago White Sox
U-13Jose MartinezTampa Bay Rays
U-14Giancarlo Stanton HR DerbyMiami Marlins
U-15Aaron Judge ASNew York Yankees
U-16Phillip Diehl RCColorado Rockies
U-17Josh FuentesColorado Rockies
U-18Felix PenaAngels
U-19Yasmani GrandalChicago White Sox
U-20Francisco CervelliMiami Marlins
U-21Kyle Lewis RC DebutSeattle Mariners
U-22Cody Stashak RCMinnesota Twins
U-23Cheslor CuthbertChicago White Sox
U-24Buck FarmerDetroit Tigers
U-25Josh Taylor RCBoston Red Sox
U-26Kyle GibsonTexas Rangers
U-27Kyle RyanChicago Cubs
U-28Eduardo NunezNew York Mets
U-29Aristides Aquino RC DebutCincinnati Reds
U-30Yasmany TomasArizona Diamondbacks
U-31Curt CasaliCincinnati Reds
U-32Drew PomeranzSan Diego Padres
U-33Alex VerdugoBoston Red Sox
U-34Justin Verlander Active LeadersHouston Astros
U-35Kyle FarmerCincinnati Reds
U-36Robinson Cano HR DerbyNew York Yankees
U-37Yoenis Cespedes HR DerbyOakland Athletics
U-38Albert Pujols Active LeadersAngels
U-39Kevin PlaweckiBoston Red Sox
U-40Antonio SenzatelaColorado Rockies
U-41Josh LindblomMilwaukee Brewers
U-42Kris Bryant ASChicago Cubs
U-43Alex BlandinoCincinnati Reds
U-44Jorge Alcala RCMinnesota Twins
U-45Zack WheelerPhiladelphia Phillies
U-46Jose SuarezAngels
U-47Jose PerazaBoston Red Sox
U-48Sandy LeonCleveland Indians
U-49Jared WalshAngels
U-50Nolan Arenado ASColorado Rockies
U-51Matt DavidsonCincinnati Reds
U-52Kyle HigashiokaNew York Yankees
U-53Brad MillerSt. Louis Cardinals
U-54Alex AvilaMinnesota Twins
U-55Miguel Cabrera ASDetroit Tigers
U-56Lane ThomasSt. Louis Cardinals
U-57Yoan LopezArizona Diamondbacks
U-58Erick Mejia RCKansas City Royals
U-59Ryan Howard HR DerbyPhiladelphia Phillies
U-60Brendan McKay RC DebutTampa Bay Rays
U-61Jedd GyorkoMilwaukee Brewers
U-62David Ortiz HR DerbyBoston Red Sox
U-63Terrance GoreLos Angeles Dodgers
U-64Alex Bregman ASHouston Astros
U-65Yoshi Tsutsugo RCTampa Bay Rays
U-66Max Scherzer Active LeadersWashington Nationals
U-67Michael FulmerDetroit Tigers
U-68Greg GarciaSan Diego Padres
U-69Derek HollandPittsburgh Pirates
U-70Skye BoltOakland Athletics
U-71Jesus AguilarMiami Marlins
U-72Drew ButeraColorado Rockies
U-73Todd FrazierTexas Rangers
U-74Harper/Segura ComboPhiladelphia Phillies
U-75Pedro Martinez ASBoston Red Sox
U-76Edwin Encarnacion Active LeadersChicago White Sox
U-77Jalen BeeksTampa Bay Rays
U-78Joe JimenezDetroit Tigers
U-79Sean Poppen RCMinnesota Twins
U-80Cody Bellinger ASLos Angeles Dodgers
U-81Junior GuerraArizona Diamondbacks
U-82Kenley Jansen Active LeadersLos Angeles Dodgers
U-83Trent Grisham RCSan Diego Padres
U-84Yusmeiro PetitOakland Athletics
U-85Felix Hernandez ASSeattle Mariners
U-86Josh HarrisonPhiladelphia Phillies
U-87Zack Greinke Active LeadersHouston Astros
U-88Craig Kimbrel Active LeadersChicago Cubs
U-89Brian JohnsonBoston Red Sox
U-90Clayton Kershaw Active LeadersLos Angeles Dodgers
U-91Julio TeheranAngels
U-92Jacob deGrom Active LeadersNew York Mets
U-93Tyler WhiteLos Angeles Dodgers
U-94Jesus Luzardo RC DebutOakland Athletics
U-95Domingo SantanaCleveland Indians
U-96Logan MorrisonMilwaukee Brewers
U-97Donovan SolanoSan Francisco Giants
U-98Jose IglesiasBaltimore Orioles
U-99Cesar HernandezCleveland Indians
U-100David PriceLos Angeles Dodgers
U-101Nick Dini RCKansas City Royals
U-102Kevin Ginkel RCArizona Diamondbacks
U-103Michael HermosilloAngels
U-104Grayson GreinerDetroit Tigers
U-105Jake Newberry RCKansas City Royals
U-106Meibrys ViloriaKansas City Royals
U-107Eric ThamesWashington Nationals
U-108Taylor WardAngels
U-109Pedro StropCincinnati Reds
U-110Mark McGwire HR DerbySt. Louis Cardinals
U-111Rich HillMinnesota Twins
U-112Nik Turley RCPittsburgh Pirates
U-113Devin Williams RCMilwaukee Brewers
U-114Josh PhegleyChicago Cubs
U-115Brad PeacockHouston Astros
U-116Robinson ChirinosTexas Rangers
U-117Cameron MaybinDetroit Tigers
U-118Frank Schwindel RCDetroit Tigers
U-119Mike Trout Active LeadersAngels
U-120Stevie WilkersonBaltimore Orioles
U-121Ichiro ASSeattle Mariners
U-122Tino Martinez HR DerbyNew York Yankees
U-123Neil WalkerPhiladelphia Phillies
U-124David Ortiz ASBoston Red Sox
U-125Chris MartinAtlanta Braves
U-126Jhoulys ChacinMinnesota Twins
U-127Ryan WeberBoston Red Sox
U-128Jonathan DavisToronto Blue Jays
U-129Hunter PenceSan Francisco Giants
U-130Richie MartinBaltimore Orioles
U-131Alex ReyesSt. Louis Cardinals
U-132Daniel DescalsoChicago Cubs
U-133Chris IannettaNew York Yankees
U-134Gleyber Torres ASNew York Yankees
U-135Brandon DixonDetroit Tigers
U-136David McKayDetroit Tigers
U-137Touki ToussaintAtlanta Braves
U-138Tommy PhamSan Diego Padres
U-139Greg AllenCleveland Indians
U-140Clayton Kershaw Active LeadersLos Angeles Dodgers
U-141Jonathan VillarMiami Marlins
U-142Albert Pujols Active LeadersAngels
U-143Francisco Lindor ASCleveland Indians
U-144Betts/Torres ComboAmerican League
U-145Ronald Acuña Jr. ASAtlanta Braves
U-146Andrew KniznerSt. Louis Cardinals
U-147Robinson Cano Active LeadersNew York Mets
U-148Pete Alonso HR DerbyNew York Mets
U-149Nick Solak RC DebutTexas Rangers
U-150Ken Griffey Jr. HR DerbySeattle Mariners
U-151Jairo DiazColorado Rockies
U-152Sam Haggerty RCSeattle Mariners
U-153Robert StephensonCincinnati Reds
U-154Mariano Rivera ASNew York Yankees
U-155Zach DaviesSan Diego Padres
U-156Wilmer FloresSan Francisco Giants
U-157Deivy Grullon RCPhiladelphia Phillies
U-158Jason KipnisChicago Cubs
U-159Steven Souza Jr.Chicago Cubs
U-160Richard BleierBaltimore Orioles
U-161Jake MarisnickNew York Mets
U-162Giovanny GallegosSt. Louis Cardinals
U-163JT RiddlePittsburgh Pirates
U-164Sam TravisTexas Rangers
U-165Kyle WrightAtlanta Braves
U-166Adolis GarciaTexas Rangers
U-167Yoshi HiranoSeattle Mariners
U-168Keynan MiddletonAngels
U-169Yadier Molina ASSt. Louis Cardinals
U-170Travis ShawToronto Blue Jays
U-171Bryse WilsonAtlanta Braves
U-172Tyler WadeNew York Yankees
U-173Edwin EncarnacionChicago White Sox
U-174Logan ForsythePhiladelphia Phillies
U-175Diego CastilloTampa Bay Rays
U-176Brock HoltMilwaukee Brewers
U-177Andy Burns RCToronto Blue Jays
U-178Jarrod DysonPittsburgh Pirates
U-179Jeff HoffmanColorado Rockies
U-180C.J. CronDetroit Tigers
U-181Mitch MorelandBoston Red Sox
U-182Josh TomlinAtlanta Braves
U-183Steve CishekChicago White Sox
U-184Miguel Cabrera Active LeadersDetroit Tigers
U-185Max Scherzer ASWashington Nationals
U-186Rowdy TellezToronto Blue Jays
U-187Pete Alonso ASNew York Mets
U-188Luis SeverinoNew York Yankees
U-189Johnny Davis RCTampa Bay Rays
U-190Ken Griffey Jr. ASSeattle Mariners
U-191Zack Greinke Active LeadersHouston Astros
U-192Ian Miller RCChicago Cubs
U-193Miguel Cabrera Active LeadersDetroit Tigers
U-194Justin Verlander ASHouston Astros
U-195Daniel HudsonWashington Nationals
U-196Nestor Cortes RCSeattle Mariners
U-197Zach Green RCSan Francisco Giants
U-198Hunter RenfroeTampa Bay Rays
U-199Adeiny HechavarriaAtlanta Braves
U-200Anthony RendonAngels
U-201Anthony Rizzo ASChicago Cubs
U-202Asdrubal CabreraWashington Nationals
U-203Austin PruittHouston Astros
U-204Eric Davis HR DerbyCincinnati Reds
U-205Kenta MaedaMinnesota Twins
U-206Asher WojciechowskiBaltimore Orioles
U-207Jorge LopezKansas City Royals
U-208Randy Arozarena RCTampa Bay Rays
U-209Cal Ripken Jr. ASBaltimore Orioles
U-210Gabe Speier RCKansas City Royals
U-211Drew SmylySan Francisco Giants
U-212Jordan LylesTexas Rangers
U-213Keury MellaArizona Diamondbacks
U-214Kendall GravemanSeattle Mariners
U-215Joey Votto Active LeadersCincinnati Reds
U-216Sean Murphy RC DebutOakland Athletics
U-217Andrew SuarezSan Francisco Giants
U-218Chapman/Olson ComboOakland Athletics
U-219Zack Greinke Active LeadersHouston Astros
U-220Alec MillsChicago Cubs
U-221Joe PanikToronto Blue Jays
U-222Scott BarlowKansas City Royals
U-223Chris DevenskiHouston Astros
U-224Cy Sneed RCHouston Astros
U-225Jharel CottonChicago Cubs
U-226Franchy CorderoSan Diego Padres
U-227Garrett RichardsSan Diego Padres
U-228Starling MarteArizona Diamondbacks
U-229Giancarlo Stanton ASMiami Marlins
U-230Cal Ripken Jr. HR DerbyBaltimore Orioles
U-231Jordy MercerDetroit Tigers
U-232Jason CastroAngels
U-233Mike MontgomeryKansas City Royals
U-234Gavin Lux RC DebutLos Angeles Dodgers
U-235Javier Baez ASChicago Cubs
U-236Bartolo Colon Active LeadersNew York Mets
U-237Clayton Kershaw ASLos Angeles Dodgers
U-238Tim LocastroArizona Diamondbacks
U-239Jefry RodriguezCleveland Indians
U-240Justin Verlander Active LeadersHouston Astros
U-241Tyler Heineman RCSan Francisco Giants
U-242Ty FranceSan Diego Padres
U-243Mike Trout Active LeadersAngels
U-244Wade LeBlancBaltimore Orioles
U-245Justin Verlander Active LeadersHouston Astros
U-246Greg HollandKansas City Royals
U-247Kole CalhounArizona Diamondbacks
U-248Miguel Cabrera Active LeadersDetroit Tigers
U-249Aroldis Chapman Active LeadersNew York Yankees
U-250Omar NarvaezMilwaukee Brewers
U-251Nico Hoerner RC DebutChicago Cubs
U-252Alex WoodLos Angeles Dodgers
U-253Peter LambertColorado Rockies
U-254Taijuan WalkerSeattle Mariners
U-255Bryce Harper HR DerbyWashington Nationals
U-256Ramirez/Lindor ComboCleveland Indians
U-257Derek Jeter ASNew York Yankees
U-258Todd Frazier HR DerbyCincinnati Reds
U-259Albert Pujols Active LeadersAngels
U-260Kyle CrickPittsburgh Pirates
U-261Trout/Upton ComboAngels
U-262Ty ButtreyAngels
U-263Miguel Cabrera Active LeadersDetroit Tigers
U-264Aaron Judge HR DerbyNew York Yankees
U-265Dario Agrazal RCDetroit Tigers
U-266Andrew McCutchen ASPittsburgh Pirates
U-267Albert Pujols ASSt. Louis Cardinals
U-268Mookie Betts ASBoston Red Sox
U-269Christian Yelich ASMilwaukee Brewers
U-270Dustin GarneauHouston Astros
U-271Kevin PillarBoston Red Sox
U-272Joey Votto ASCincinnati Reds
U-273Devers/Bogaerts ComboBoston Red Sox
U-274Jordan MontgomeryNew York Yankees
U-275Brett AndersonMilwaukee Brewers
U-276Joe KellyLos Angeles Dodgers
U-277Jose Altuve ASHouston Astros
U-278Austin AllenOakland Athletics
U-279Bryce Harper ASWashington Nationals
U-280Albert Pujols Active LeadersAngels
U-281Joel Kuhnel RCCincinnati Reds
U-282Christian ArroyoCleveland Indians
U-283Tomas NidoNew York Mets
U-284Buehler/Martin ComboLos Angeles Dodgers
U-285Billy HamiltonSan Francisco Giants
U-286Chase AndersonToronto Blue Jays
U-287Chris Sale ASBoston Red Sox
U-288Giancarlo Stanton Active LeadersNew York Yankees
U-289Myles StrawHouston Astros
U-290Alonso/McNeil ComboNew York Mets
U-291Trayce ThompsonArizona Diamondbacks
U-292Mike Trout Active LeadersAngels
U-293Mike King RCNew York Yankees
U-294Adam PlutkoCleveland Indians
U-295Chris Sale Active LeadersBoston Red Sox
U-296Mark McGwire HR DerbyOakland Athletics
U-297Jesus Tinoco RCColorado Rockies
U-298Magneuris SierraMiami Marlins
U-299Jacob deGrom ASNew York Mets
U-300Yordan Alvarez RC DebutHouston Astros

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