He most recently defended his Art of Fighting welterweight title against Waachiim Spiritwolf defeating him via clear-cut unanimous decision. Delson next faced Jucelino Ferreira, winning via first-round armbar submission.
He was next set to face Luis Dutra Jr. Dutra Jr. was unfortunately injured and replaced by Gil de Freitas. De Freitas took sick as well and was forced to pull out. Heleno stepped in to replace an injured Murilo Bustamente in the main event against veteran Yuya Shirai. Heleno defeated Shirai via majority decision.
Not sure what may have happened between then at this moment but Heleno next competed on the first all-Brazilian season of The Ultimate Fighter at 185 pounds. He made his UFC debut in Brazil against castmate and prospect Fransisco Trinaldo, losing via first-round technical knockout.
- Delson Heleno vs. Mike Dolce
- Gideon Ray vs. Delson Heleno - The fight was in the semifinals of the IFL welterweight grand prix tournament.
- Delson Heleno vs. Jake Ellenberger - Jake Ellenberger stepped in to replace an injured Rory Markham.
- Jay Hieron vs. Delson Heleno - The fight was the finals of the IFL welterweight grand prix for the vacant IFL welterweight title.
- Brad Blackburn vs. Delson Heleno - Many thought Heleno was winning a decision until the comeback knockout from Brad Blackburn.
- Fransisco Trinaldo vs. Delson Heleno - The fight was the UFC debut of both men.