Yadier del Valle

"The Cuban Problem". That's what they call Yadier del Valle, and is part of the UFC featherweight division's deep end, fighting out of Cuba — 11 pro fights in, still swinging for a number next to his name.

A submission threat first and always — 4 taps forced in 10 wins. Every exchange on the mat carries a trap door. Add the southpaw stance, and the puzzle gets harder still.

The last fight went to Jordan Leavitt (Decision - Unanimous) — a setback, and the interesting question is always what a fighter does with one.