He was famous as a practitioner of Luta Livre and was one of the last representatives of this art form. Mikey Burnett broke his hand hitting Tadau in their UFC fight. Tadeu was famous along with Hugo Duarte for never backing down from a challenge.
In the JJ vs Martial Arts Challenge in 1983, Tadeu defeated Renan Pitanguy by TKO. In 1988 he fought Royer Gracie to a draw.
He was scheduled to fight Ralph Gracie but this never materialized. This was because Tadeu did not submit his visa in time.
Tadeu fought Royler Gracie to an hour long draw. Tadeu is known as a Gracie conqueror.
His most famous fight was with Renzo Gracie.
Renzo and Tadeu were long time rivals. The rivalry has been described as being a Hatfield vs McCoy style rivalry because in South America machismo is the rule. Renzo once said My name is not a bone to be carried in the jaw of a dog," before slapping the guy and declaring "you don"t deserve my fist." This was Renzo"s last bare knuckle fight.
The riot from this fight led to Mobile Marketing Association being banned from Rio de Janeiro.
Renzo claimed he was dominating the fight, but was having issues due to the oil that was on Tadeu"s body. After 15 minutes Renzo refused to rise and beckoned Tadau to grapple.
Renzo punched a fan in the face, causing more fans to riot. The fight has been ranked one of the best fights to be ruled a no contest.
The riot was featured on World"s Dumbest Criminals and is listed as the #8 Worst Moment In Mobile Marketing Association History by Entertainment and Sports Programming Network.