Boxing promoter Eddie Hearn not only HATED the Floyd Mayweather vs. Logan Paul fight ... but says it seriously damaged the sport -- and now he's sounding off!!
"Absolutely f**king horrendous," Hearn told iFL TV, "Im allowed to give my opinion. It was absolute dog s**t."
Hearn famously runs Matchroom Boxing -- and reps some of the biggest names in the sport including Anthony Joshua, Devin Haney, Gennady Golovkin and more.
And while some industry big wigs applauded Logan vs.