All his life, this self-taught wizard never got a break...until a million-to-one shot to duel Voldemort fell into his lap.
They fought, then became friends before some juiced-up Russian beat Voldy to death in the ring, which he then avenged. Pretty much standard stuff at Mighty Mick's Gym of Wizard Schooling.
Also, much like the real Rocky Balboa and Harry Potter, he nailed his best friend's sister.
[Source] (Obscene Language)