User blog comment:Lover of the Muse/Izuku vs Monoma: One for All battle!/@comment-36960199-20180929034929

Honestly, there's no chance Monoma would win. As we see in the first few episodes, Deku trains for months to become better at using One for All. Even though he trained for months, he still can't contain the power of One for All unless using it at 5% or, in the movie he gets a "Full Gauntlet" from Melissa which allows him to use One for All without damaging his body. Monoma, however, has had no training (or atleast, none noted in the anime and manga), and the only reason Deku is still alive is because he trained for months. If Monoma used One for All, he would not be able to contain the power. As a result, he'd probably either get seriously injured, or just plain die.