If Jermell Charlo is gonna beat Canelo Alvarez this weekend, it'll be a big punch that turns the boxing superstar's lights out, according to former champion Shawn Porter ... who says that's JC's only path to victory.
"Let's be honest. If he beats Canelo, it's only by knockout. That's the only way [Jermell] gets the win. And it's a one-punch knockout," Porter told TMZ Sports in Vegas.
Shawn knows a thing or seventeen about putting dudes on their backs ... 17 of the 2x welterweight champ's 31 professional wins came by way of knockout.