Nicknamed "The Fireball Kid", Gomi had a ten-fight winning streak spanning 2004 to 2006 in Pride FC, the longest in the organization's history.

During this streak, Gomi knocked out Ralph Gracie in six seconds, the quickest knockout victory in Pride FC history.

He made his professional mixed martial arts debut on November 27, 1998, at Shooto Las Grandes Viajes 6 in Tokyo, where he defeated Hiroshi Tsuruya by decision.

Gomi became the Shooto World Lightweight Champion in 2001 after defeating former teammate Rumina Sato by unanimous decision on December 16.

Gomi then defeated highly regarded American grappler Chris Brennan on September 16, 2002, via unanimous decision.

After back-to-back losses, Gomi found a new home in Japan's biggest MMA organization, the Pride Fighting Championships.

He made his debut within the organization on February 15, 2004, at Pride Bushido 2 where he fought Jadyson Costa of the famed Chute Boxe team out of Brazil.

Unlike his fight with Penn, Gomi made quick work of Gracie, scoring a six-second KO in the first round, the quickest match in the organization's history, due to repeated knee strikes.

Azeredo dominated the fight from the opening bell with knees, punches, and flying kicks, but at the 3:46 mark of the first round, Gomi caught Luiz with two hooks that sent the Chute Boxe fighter to the mat.

Gomi was then criticized for continuing to attack, even after Azeredo became unconscious, and was restrained by Dream Stage Entertainment (DSE) crew and staff.

This fight was billed "the battle of the twenty first century boys" in Japan due to the popularity and world-class match up of the two fighters.

"The Fireball Kid" began to rain down punches, and after taking many shots Sakurai twisted to escape, giving his back to Gomi.

Although Aurelio won the match, it was a non-title bout, with Gomi remaining the Pride Lightweight Champion.

Baron rolled in an attempt to shake off his Japanese opponent, but Gomi held on, sinking in a rear-naked choke.

Gomi showed shades of his past catch wrestling accolades when he countered another Aurelio takedown attempt with a half-nelson.

Less than a minute into the fight Gomi countered a right leg kick from Ishida with a straight left punch that knocked him down.

In the beginning of the first round, Gomi was landing blows on the taller Diaz, even scoring a knockdown, which he was unable to capitalize upon.

However, Diaz came back quickly and began to bombard Gomi, who had become visibly exhausted, with straight jabs and right hands for the later half of the round.

As the second round opened, Gomi gamely tried to regain lost ground, but after a double leg takedown into Diaz's guard, suddenly found himself in a gogoplata submission.

However, the Nevada State Athletic Commission has declared the fight a "no contest" after Diaz tested positive for marijuana.

After Zuffa, the parent company of the UFC, purchased Pride Fighting Championships from Dream Stage Entertainment, Gomi signed on with World Victory Road, and fought in its inaugural event, "Sengoku", where he defeated Duane Ludwig by TKO (cut).

Gomi competed on November 1, 2008, where he lost a split decision to Russian fighter Sergey Golyaev at Sengoku VI.

Gomi faced Nate Diaz on September 24, 2011, at UFC 135 where he lost late in the first round by submission due to an armbar.

[16] Gomi was expected to face George Sotiropoulos on February 26, 2012, at UFC 144 but the Australian fighter pulled out after sustaining an injury.

Gomi defeated Mac Danzig via split decision on November 10, 2012, at UFC on Fuel TV 6.

[18] Gomi, keeping true to his plead, came into the fight in considerably better shape and showcased a drastically improved game including taking Danzig down a few times.

[31] Gomi faced Dong Hyun Kim on September 23, 2017, at UFC Fight Night: Saint Preux vs.

[38] Gomi faced Tenshin Nasukawa in a two-round exhibition boxing match at Rizin 33 - Saitama on December 31, 2021.

[40] Unusual for a Japanese mixed martial artist of his style and class, Gomi was a strong sprawl and brawl fighter.

[42] Gomi would harmoniously use both orthodox and southpaw stances, combining the left straight with a feared overhand right, also using the clinch to set up strikes.