I think 5'9 inches about correct for Hagler. Bald guys always look a little shorter than they are. I think Leonard, listed at 5' 10 1/2 had about an inch on Marvin.
He was slightly taller in the morning than he was at night, roughly about 1cm taller, and if he stood on his money and I stand on my money then he’s a decent amount taller than me that’s for sure
Few people around here took a pic with him, maybe they can chime in. I stood by him for a minute and wondered..maybe people do shrink as they get older cause he didn't look 3 inches shorter than me...seemed more like 4 or 5.
More likely around 5 '8 . Duran the first time he met Hagler who he had alway's admired said to his manager Luis Spada in front of Hagler " I'm almost tall like Marvin i fight him next ". This was around the Moore fight and Hagler who had being quite cordial turned his back as now a potential rival forget about being friends.