Steph Curry -- Coaches Boxing Star ... In Ugly Free Throw Shot (VIDEO)

Steph Curry is a miracle worker ... 'cause he mentored a boxing star who NEVER touched a basketball in his life -- into hitting a free throw shot on an NBA court.

Seriously, it's one of the ugliest shots ever -- but props to both Steph and Amir Khan ... because despite the ridiculously awkward shooting motion -- Khan hit the shot!