Faatumu le fuaiupu lenei: Na iai Greenstein i faasologa muamua e tolu o le Poker Superstars Invitational Tournament ma faasologa uma e fitu o le GSN "High Stakes Poker". Na ia faʻaalia foi i le tolu vaitau muamua o le tuai o le po faʻasologa "Poker After Dark" i luga o le NBC. Ua manumalo foʻi Greenstein i ni taʻamilosaga se lua a le World Poker Tour (WPT): o le Fifth Annual Jack Binion World Poker Open ($ 1,278,370), ma le 2006 WPT Invitational i le Commerce Casino ($ 100,000). Na ia manumalo foi i isi suafa WPT e lua i mea faapitoa: WPT Tama ma Atalii Taamilosaga, 2006 World Poker Finals; ma WPT Poker e le Tusi: Mataupu 2. E oʻo mai i le 2008, ua amata ona ia foaʻi atu ana tupe mama i le alofa mama. I le 2008 World Series of Poker (WSOP), na maua ai e Greenstein le $768,461 i taaloga e ono. Na ia faʻauʻuina foʻi lona lua i le 2008 WSOP Player of the Year standings, i tua atu o Erick Lindgren. I totonu
I le 2011, e lima taimi na manumalo ai Greenstein i le World Series of Poker, e aofia ai le tulaga tolu i le $10,000 Limit Hold'em Championship mo le $169,512 ma le tulaga 15 i le $50,000 Player's Championship.