Mr. 450 in August 2015
|Birth name||John Jesus Yurnet|
|Born||Hormigueros, Puerto Rico|
|Professional wrestling career|
Jesús De León
|Billed height||5 ft 8 in (1.73 m)|
|Billed weight||182 lb (83 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 by winning the junior heavyweight titles of the three main Puerto Rican companies (at that time) . 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 where he saw action on Michinoku Pro Wrestling and Pro Wrestling Zero1. After Japan, he went back to the United States to wrestle in Fight The World Wrestling where he won the FTW World Championship. He later came back to Puerto Rico in October 2014 to World Wrestling League event Inssurection where he faced El Sensacional Carlitos, this match being named The Match Of The Year. Later that November they faced each other again.
In December 2014, Mr. 450 Hammett wrestled Bull Dempsey as Jesús De León on an episode of WWE NXT. On July 22, 2015, he made a second appearance on NXT losing to Baron Corbin in less than 5 seconds. On August 19, he made another NXT appearance in an eight-man tag team match, teaming with Jesse Sorensen, Aaron Solow and Jonny Vandal losing to Enzo Amore, Colin Cassady and The Hype Bros (Zack Ryder and Mojo Rawley).
He returned to WWC on April 4, 2015 to challenge for the Universal World Hevyweight Championship in the main event of Camino a la Gloria, but the match ended without a clear winner and Carlos "Chicano" Cotto retained. The series between both peaked in a cage match, which Hammet won to become the Universal Heavyweight Champion. At Aniversario 2015, he defeated Carly Colón to retain. During his reign as champion, Hammet would wear the belt in his appearances outside of Puerto Rico, carrying it with him in matches throughout the independent circuit of the United States and Canada. In an interview with WrestleZone, he explained that his intention was to give the title the foreign exposition that it had when Carlos Colón and Dory Funk feuded over it in the NWA territories and that he wanted people to feel "[that] this guy is going over to Japan with the belt and representing the island there. [...] This guy is going to Ecuador and he’s representing there." On October 16, 2015, he debuted in Caution Wrestling Federation (CWF) by successfully defending the Universal Heavyweight Championship against masked luchador Zoom Driver, marking the first time that the title had been on the line in Mexican territory. On March 5, 2016, he lost the Universal Championship against Carlito.
On August 7, 2016, Mr. 450 defeated Ricochet to win the Wrestling Superstar World Submission Lucha Championship in Chile. Wrestling as "Jesus Yurnet", he returned to WWE NXT on the September 28, 2016 episode, teaming with Johnathan Cruz in a losing effort against The Authors of Pain.
- Finishing moves
- Spirit Bomb (450° splash)
- Signature moves
- Final Flash (Lifting single underhook DDT)
- Frog splash
- Modified slingshot tornado DDT
- Suicide dive
- Release belly-to-back suplex followed by a kick to the back of the falling opponent
- Saiyan Driver (Cradle piledriver)
- 619 (Tiger feint kick to the head of an opponent draped over the second rope) followed by a modified slingshot tornado DDT - adopted from Rey Mysterio
- "El Enigma"
- "The Last Of His Kind"
Championships and accomplishments
- Chicago Style Wrestling
- Dreamwave Wrestling
- Alternative Championship (1 time)
- Fight the World Wrestling
- FTW Heavyweight Championship (1 time) 
- Independent Championship Wrestling
- ICW Pure Crown X Championship (1 time)
- International Wrestling Association
- Lucha Chicago Championship
- LCPW Heavyweight Championship (1 time)
- New Wrestling Stars
- NWS Cruiserweight Championship (1 time)
- NWA Signature Pro
- NWA/FUW Flash Championship (1 time)
- Pacific Coast Wrestling
- PCW Light Heavyweight Championship (1 time, current)
- Pro Wrestling Blitz
- PWB No Limits Championship (1 time)
- Pro Wrestling Illustrated
- Wrestling And Respect Wrestling
- WAR Tag Team Championship (1 time) – with Marshe Rockett
- World Wrestling Council
- Wrestling Superstar
- WS World Submission Lucha Championship (1 time)
- World Wrestling League
- "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.
- "Pro Wrestling Illustrated (PWI) 500 for 2016". The Internet Wrestling Database. Retrieved 2016-09-01.