B ▁Am ateur ▁D raft . ▁ ▁Career ▁For ster ▁rapidly ▁asc ended ▁to ▁the ▁big ▁league ▁level , ▁making ▁the ▁White ▁So x ' s ▁opening ▁day ▁ro ster ▁in ▁ 1 9 7 1 ▁after ▁only ▁ 1 0 ▁games ▁at ▁the ▁single - A ▁level ▁in ▁the ▁minor ▁le agues . ▁He ▁recorded ▁a ▁ 3 . 9 9 ▁E RA ▁and ▁hit ▁. 4 0 0 ▁( 2 ▁for ▁ 5 ) ▁as ▁a ▁ 1 9 - year - old . ▁He ▁became ▁Chicago ' s ▁top ▁relief ▁pitch er ▁in ▁ 1 9 7 2 ▁and ▁saved ▁ 2 9 ▁games , ▁which ▁ranked ▁second ▁in ▁the ▁American ▁League ▁that ▁season . ▁After ▁splitting ▁time ▁between ▁the ▁b ull pen ▁and ▁the ▁starting ▁rotation ▁in ▁ 1 9 7 3 , ▁For ster ▁returned ▁primarily ▁to ▁the ▁b ull pen ▁in ▁ 1 9 7 4 ▁and ▁led ▁the ▁American ▁League ▁in ▁saves ▁with ▁ 2 4 . ▁He ▁then ▁missed ▁most ▁of ▁ 1 9 7 5 ▁with ▁an ▁arm ▁injury , ▁which ▁allowed ▁team mate ▁Rich ▁G oss age ▁to ▁become ▁the ▁league ▁leader ▁in ▁saves ▁that ▁season . ▁ ▁In ▁ 1 9 7 6 , ▁new ▁White ▁So x ▁manager ▁Paul ▁Rich ards ▁decided ▁to ▁put ▁For ster ▁in ▁the ▁starting ▁rotation . ▁The ▁experiment ▁back f ired , ▁as ▁For ster ▁respond ed ▁with ▁a ▁ 2 - 1 2 ▁record . ▁At ▁the ▁end ▁of ▁the ▁season ▁he ▁was ▁trad ed