Career
A professional competitor since 2009, Guerreiro was also a contestant on The Ultimate Fighter: Brazil. Early career
De Assis started his professional career in 2009. Until 2012, he fought only in promotions within his home state of Amapá.
The Ultimate Fighter
De Assis was defeated by Rodrigo Damm during the entry round via submission due to a rear-naked choke in round two.
Bellator Mobile Marketing Association
In November 2012, it was announced that de Assis had signed with Bellator. De Assis made his debut against Magomedrasul Khasbulaev on February 7, 2013 at Bellator 88 in the quarterfinal match of Bellator season eight featherweight tournament.
He lost via submission due to an arm-triangle choke in the second round. De Assis faced Desmond Green on September 13, 2013 at Bellator 99 in the quarterfinal match of Bellator season nine featherweight tournament.
De Assis then faced Patricio Freire in the semifinals on October 11, 2013 at Bellator 103.
He lost the fight via unanimous decision (30-27, 30-27, 30-27). De Assis faced Shahbulat Shamhalaev on May 17, 2014 at Bellator 120. De Assis was expected to face Nick Piedmont on January 16, 2015 at Bellator 132.
However, Piedmont pulled out of the fight for an undisclosed reason.
De Assis was removed from the fight card as a result. De Assis faced John Teixeira at Bellator 136 on April 10, 2015.
He lost the fight by split decision.
