x ▁AA U ▁tournament . ▁And ▁before ▁his ▁first ▁year ▁of ▁high ▁school , ▁he ▁attended ▁the ▁Ad idas ▁ABC D ▁Camp , ▁where ▁he ▁challeng ed ▁O . ▁J . ▁May o ▁to ▁a ▁one - on - one ▁game . ▁ ▁In ▁the ▁summer ▁of ▁ 2 0 0 5 , ▁Steph enson ▁en rolled ▁at ▁Bishop ▁L ough lin ▁Memorial ▁High ▁School , ▁but ▁he ▁only ▁attended ▁the ▁school ▁for ▁three ▁days , ▁before ▁the ▁school ▁lost ▁in ▁the ▁championship ▁game ▁of ▁a ▁youth ▁league ▁and ▁he ▁did ▁not ▁win ▁the ▁tournament ▁M VP . ▁The ▁following ▁week , ▁Steph enson ▁did ▁not ▁return ▁to ▁classes ▁at ▁Bishop ▁L ough lin , ▁and ▁was ▁att ending ▁Abraham ▁Lincoln ▁High ▁School ▁near ▁his ▁home ▁in ▁C oney ▁Island . ▁National ▁Basketball ▁Association ▁players ▁Ste phon ▁Mar bury , ▁Sebastian ▁T elf air , ▁and ▁future ▁Set on ▁Hall ▁University ▁star ▁Isa iah ▁White head ▁had ▁also ▁attended ▁and ▁played ▁basketball ▁at ▁Lincoln ▁High . ▁Head ▁coach ▁D way ne ▁Mort on ▁said , ▁"{ Ste ph enson } ▁always ▁talked ▁about ▁out do ing ▁Sebastian , ▁out do ing ▁Ste phon ," ▁and ▁called ▁him ▁" The ▁best ▁I ' ve ▁ever ▁had ▁at ▁Lincoln ." ▁Steph enson ▁went ▁on ▁to ▁lead ▁the ▁Rails plit ters ▁to ▁the ▁city ▁title ▁that ▁year . ▁ ▁Lincoln ▁High ▁repeated ▁as ▁champions ▁his ▁s oph om ore ▁and ▁junior ▁years , ▁while ▁Steph enson ▁won ▁back - to - back ▁Player ▁of ▁the ▁Year