15. Tony Halme
Most ardent wrestling fans know Tony Halme, as he failed to last a year in the World Wrestling Federation. He played performer Ludvig Borga for a couple of months before parting ways with his company. If he failed at the WWF, you know how he would fare at the UFC. In 1997, he met Randy Couture at UFC 13.
He did not last a minute under Couture. Halme never signed for the competition again, choosing instead to fight personal battles. He lost these too, as he succumbed to a self-inflicted gunshot in January 2010. Whether he is the biggest loser in the UFC is debatable.