Canadian O’Sullivan Scores KO in Sixth

HAMILTON, Canada — Olympian Shawn O’Sullivan of Toronto knocked out Junior Nash of Philadelphia at 1:45 of the sixth round in a middleweight bout Tuesday night at McMaster University in Ontario.

O’Sullivan, 23, the silver medalist at the Los Angeles Olympics, remained unbeaten as a pro, improving to 5-0. Nash, 24, dropped to 10-3-1.