Yoel Romero
Former UFC fighter Romero possessed terrifying power and athleticism. However, the Cuban was also a master of the dark arts and didn’t mind cheating if it gave him an edge. He fought Tim Kennedy at UFC 178 when the infamous StoolGate went down. Romero’s coach rubbed Vaseline on his fighter’s body. The referee noticed and forced him to wipe Romero’s chest.

However, this also gave Romero extra rest because he sat on his stool as his coach cleaned him. He blatantly cheated and it was bad sportsmanship. Romero is also famous for grabbing his opponents’ gloves and the fence. Some rivals even accused him of deliberately missing weight to gain an advantage (via SCMP).