Early career Guida only had two amateur fights before turning professional in 2003.
The Ultimate Fighter Guida appeared on
The Ultimate Fighter: Team Nogueira vs. Team Mir and was eliminated in the first episode for failing to make the 206 lb weight limit by one pound.
Independent promotions Following this, as a last minute replacement for
Ken Shamrock, Guida faced former
WWE pro wrestling star
Bobby Lashley. Guida lost via unanimous decision. Before his bout with Lashley, he and Guida got in a scuffle at a pre-fight
press conference that had to be broken up by
Roy Jones Jr. Guida then suffered losses to UFC veteran
Jeremy Horn and top
Chechen contender
Mamed Khalidov, but overcame his losing streak with a knockout win over former
UFC fighter
Logan Clark, ending the fight with a barrage of punches in the first round in Clark's hometown of
Rochester, Minnesota. In 2009 Jason was set to take on 2011 ADCC World Championship Nottingham Gold Medalist and former UFC fighter,
Vinny Magalhães in the main event of "Carolina Crown 2" as a late replacement for Lance Evans, the brother of UFC star
Rashad Evans. He later dropped out of the fight due to a lower back injury sustained during training, he was replaced by Bellator fighter
Chris Davis. In 2010, Guida then tried out for
The Ultimate Fighter 12 in the
Light Heavyweight division but was unsuccessful when the Light Heavyweights were cut before the season started in favor of a
Lightweight only season.
Bellator Guida stepped in as a replacement and fought Justin Lemke at
Bellator 29 in a 210 lb catchweight bout and his
Bellator debut. Guida weighed in 5 lbs over the catchweight limit and the fight was changed to a 215 lb catchweight bout. In 2011, Jason joined his brother Clay and started training under top
mixed martial arts trainer,
Greg Jackson, in an attempt to reinvent his fighting career. On November 16, 2012 Guida was scheduled to make his return against former
UFC veteran
Jason Brilz in the main event of Disorderly Conduct 13. The fight was later scrapped due to an injury Jason suffered training with
Greg Jackson's MMA. Guida fought
Anthony Gomez at
Bellator 112 on March 14, 2014, after his original opponent
Sean Salmon pulled out for undisclosed reasons. He lost via unanimous decision. ==Controversies==