Who reigned for 50 months as lineal champion  and fought Richard Williams?
Sergio Martínez (boxer): Sergio Gabriel Martínez (born February 21, 1975) is an Argentine former professional boxer who competed from 1997 to 2014. Sergio Martínez (boxer):  Martínez's 50-month reign as lineal champion ranks as one of the longest in middleweight history.
i don't know