▁league ▁debut ▁on ▁June ▁ 2 5 , ▁ 1 9 5 3 ▁in ▁Philadelphia ▁as ▁a ▁late - in ning ▁replacement ▁for ▁out f iel der ▁Jim ▁D els ing . ▁Kal ine ▁wore ▁number ▁ 2 5 ▁during ▁his ▁ro ok ie ▁campaign , ▁but ▁asked ▁team mate ▁Pat ▁M ull in ▁for ▁his ▁No . ▁ 6 ▁after ▁the ▁ 1 9 5 3 ▁season ▁ended . ▁Kal ine ▁wore ▁the ▁number ▁for ▁the ▁rest ▁of ▁his ▁major ▁league ▁playing ▁career . ▁ ▁In ▁ 1 9 5 5 , ▁at ▁age ▁ 2 0 , ▁Kal ine ▁ended ▁the ▁season ▁with ▁a ▁. 3 4 0 ▁batt ing ▁average , ▁becoming ▁the ▁young est ▁player ▁ever ▁to ▁win ▁the ▁American ▁League ▁( AL ) ▁batt ing ▁title . ▁No ▁ 2 0 - year - old ▁major ▁league ▁player ▁had ▁won ▁a ▁batt ing ▁title ▁since ▁Ty ▁C obb ▁in ▁ 1 9 0 7 . ▁During ▁the ▁ 1 9 5 5 ▁season , ▁Kal ine ▁became ▁the ▁ 1 3 th ▁man ▁in ▁major ▁league ▁history ▁to ▁hit ▁two ▁home ▁runs ▁in ▁the ▁same ▁in ning , ▁became ▁the ▁young est ▁to ▁hit ▁three ▁home ▁runs ▁in ▁one ▁game , ▁and ▁finished ▁the ▁year ▁with ▁ 2 0 0   h its , ▁ 2 7   home ▁runs ▁and ▁ 1 0 2   run s ▁batt ed ▁in ▁( R B Is ). ▁ ▁He ▁also ▁finished ▁second ▁to ▁Y og i ▁Ber ra ▁in