He scored a second-round knockout of Fernando Godinez on May 4, 2018, and won a split decision against Masamichi Yabuki on September 29, 2018.
[6] Matellon compiled a record of 11–0–2 before defeating Erik Lopez via majority decision (MD) to win the WBA interim light-flyweight title on 7 February 2020 at the Roberto Durán Arena in Panama.
[8] Matellon was scheduled to make his first WBA Interim title defense against the former IBF mini flyweight champion Jose Argumedo on June 26, 2021.
[10] Matellon next faced Ivan Garcia for the vacant WBA Fedecaribe light flyweight title on July 16, 2022.
[11] Matellon faced the former WBA (Regular) light flyweight champion Carlos Cañizales in a WBA light flyweight title eliminator on June 10, 2023, at the Casino Buenos Aires in Buenos Aires, Argentina.