Unbeatens Porter, Quillin defend world titles

Undefeated Shawn Porter stopped former world champion Paulie Malignaggi in the fourth round Saturday to retain his International Boxing Federation welterweight crown.

Unbeaten Porter defends title against Malignaggi

Undefeated Shawn Porter puts his International Boxing Federation world welterweight title on the line against former world champion Paulie Malignaggi in an all-American showdown Saturday.