Watch the full fight between Cory Hendricks and Marcel Fortuna.

Watch the full fight between JJ Aldrich and Kristi Lopez.

Watch the full fight between Phillip Hawes and Andrew Sanchez.

Watch the full fight between Irene Rivera and Kate Jackson

Watch the full fight between John Paul Elias and Abdel Medjedoub

Watch the full fight between Khalil Rountree and Muhammed Dereese.

Watch the full fight between Ashley Yoder and Jodie Esquibel

Watch the full fight between Ashley Cummins and Lanchana Green.

Watch the full fight between Amy Montenegro and Helen Harper

Watch the full fight between Norman Paraisy and Elias Urbina

Watch the full fight between Alyssa Krahn and Jamie Moyle.

Watch the full fight between Tatiana Suarez and Chel-C Bailey

Watch the full fight between Eric Spicely and Kenneth Bergh

WSOF's “Who’s The Toughest?” series kicked off at The Theater at Madison Square Garden where 2 Marine Corp veterans Shane Kruchten and Jeremy Mahon battled in a catchweight fight on New Year's Eve.

It's Kun Khmer vs Karate as two seasoned strikers clash in the ONE Championship cage. Find out how this fight finished!