Oscar De La Hoya Says Floyd Mayweather Wouldn't Last 10 Seconds in UFC Fight

Oscar De La Hoya has set the over/under for how long Floyd Mayweather would last in a UFC fight ... and Floyd's not gonna like it.

We got Oscar heading into Staples Center for a Lakers game the other day and asked him how his former boxing rival would fare in MMA.

De La Hoya's prediction -- "Tapped out in 10 seconds."

Ouch.

FYI, Floyd says he probably ain't gonna test his skills inside the Octagon ... but money talks, so don't rule it out.

Speaking of money fights, Oscar updated us on his quest to do business with Dana White ... a couple weeks after TMZ Sports got his initial pitch.