Hagler ( 62 - 3 - 0 , 52 knockouts ) performed like a brilliant athlete .
It was hard work in the gym that allowed Hagler to develop Hagler 's fighting ability in general Hagler 's his punching power in particular .
Hagler ( 62 - 3 - 0 , 52 knockouts ) performed like a brilliant athlete , but it was hard work in the gym that allowed him to develop his fighting ability in general and his punching power in particular .