Matthew Stanley Hamill (born October 5, 1976) is a retired American wrestler and mixed martial artist. He is a three-time NCAA Division III National Champion in wrestling (167 lb class in 1997, 190 lb class in 1998 and 197 lb class in 1999) while attending the Rochester Institute of Technology (RIT) in Rochester, New York. Hamill also has a silver medal in Greco-Roman wrestling and a gold medal in freestyle wrestling from the 2001 Summer Deaflympics. He is notable for being the only man to defeat the current UFC Light Heavyweight Champion Jon Jones, the fight ending via referee stoppage.

Born in Loveland, Ohio, Hamill was deaf from birth. He was introduced to wrestling by his step father who was a wrestling coach at Loveland High School. Hamill attended the Rochester Institute of Technology for 3 years transferring there after a year at Purdue.

Hamill was a contestant on the third season of The Ultimate Fighter reality television show, training under Tito Ortiz in the 205 lb (93 kg) weight class. He won a preliminary fight against Mike Nickels via decision, but was unable to continue into the semi-finals due to injuries. On June 24, 2006, Hamill fought fellow contestant Jesse Forbes at The Ultimate Fighter 3 Finale on Spike TV and won via KO.

Jacob Christopher "Tito" Ortiz (English: /tɪtɵ ɔərtɪs/) (born January 23, 1975) is an American mixed martial artist and former UFC Light Heavyweight Champion, having held the title from April 14, 2000 to September 26, 2003. Along with fighters like Randy Couture and Chuck Liddell, he was one of the sport's early stars. Ortiz ultimately became the biggest pay-per-view draw of 2006 for his fights with Liddell, Forrest Griffin, and Ken Shamrock.

Outside of his fighting career, Ortiz is the CEO of the Punishment Athletics MMA equipment and clothing line. He also owns an MMA training gym called Punishment Training Center, which is located in Huntington Beach, CA.

Jacob Christopher Ortiz was born to Samuel and Joyce Ortiz. He received his nickname "Tito," which means tyrant, from his father when he was a year old. He is the fourth child of his mother, Joyce, who had three sons from a previous marriage. His mixed heritage (Mexican father, American mother) has been reflected in his ring entrances as he has borne both Mexican and American flags.