|Birth name||John Yurnet|
|Born||Hormigueros, Puerto Rico|
|Professional wrestling career|
Jesús De León
|Billed height||5 ft 8 in (1.73 m)|
|Billed weight||215 lb (98 kg)|
|Trained by||Invader III
Hammett started his wrestling career working on the independent circuit of Puerto Rico, working for Xtreme Wrestling Entertainment (XWE) among others. He later entered the New Wrestling Stars (NWS) in 2005 and was a member of the stable "HP" with Ash, Livewire, and, later on, Stefano. Hammett became NWS's first Junior Heavyweight Champion after winning a tournament on March 26, 2006 but, after having problems with the company, soon vacated the title and left for the International Wrestling Association (IWA). During this time Hammett continued wearing the title until the New Wrestling Stars requested it back.
Hammett soon became IWA's Junior Heavyweight Champion just two weeks later in Bayamón, Puerto Rico defeating champion Blitz. During his time with IWA, Hammet teamed with both Tommy Diablo and Carlitos in tag matches before leaving IWA to return to the NWS. Where on August 13, 2006 in Aguadilla, Puerto Rico, Hammet made his first appearance after the match between Bolo The Red Bulldog and William De La Vega, running in through the crowd. Hammet helped out De La Vega, Noriega, and Sabu Kid clear the ring of his former HP team mates.
The appearance was a one-off, however, as Hammett left the company again the next day to enter the World Wrestling Council (WWC). While in WWC, Hammett feuded with Brent Dail, Alex Montalvo and Eli Rodriguez. Hammet soon won WWC's Junior Heavyweight title, becoming the first wrestler in Puerto Rican Wrestling to win the triple-crown of the three different Puerto Rican junior heavyweight titles. He also had feuds with wrestlers like Rick Stanley, William De La Vega, BJ, Rico Suave and Tim Arson whom he wrestled for the WWC tag team championships. In his feud with BJ he became the WWC Television Champion on March 1, 2008, and held it for two weeks before dropping it back to BJ. By September 2008, he decided to leave WWC and joined Windy City Pro Wrestling. On February 19, 2010, he defeated Steve Boz to win the Lucha Chicago Championship, In 2014, Mr 450 traveled to Japan when see action on Michinoku Pro Wrestling and Pro Wrestling Zero1 back on USA goes to Fight The World Wrestling and win the FTW World Championship. He will come back to Puerto Rico in October to World Wrestling League event Inressurection who been face to El Sensacional Carlitos.
- Finishing moves
- Signature moves
- "El Enigma"
- "The Last Of His Kind"
Championships and accomplishments
- Chicago Style Wrestling
- Dreamwave Wrestling
- Alternative Championship (1 time)
- Lucha Chicago Championship
- LCPW Heavyweight Championship (1 time, current)
- NWA Signature Pro
- NWA/FUW Flash Championship (1 time, current)
- Fight The World Wrestling
- FTW Heavyweight Championship (1 time) 
- Pro Wrestling Blitz
- PWBlitz No Limits Championship (1 time)
- Wrestling And Respect Wrestling
- WAR Tag Team Championship (1 time) - with Marshe Rockett
- World Wrestling Council
- "The Former Triple Crown Jr. Heavyweight Champion of Puerto Rico: Mr 450 Hammet". Windy City Pro Wrestling. Archived from the original on October 12, 2008. Retrieved 2008-09-28.