Roman amassed a 15-2-1 record during the next five years, with five stoppage victories,[1] before being scheduled to fight Daniel Noriega for the vacant WBA-NABA super bantamweight title on July 24, 2015.
[8] Roman made his fourth and final WBA NABA title defense against Enrique Quevedo on August 26, 2016.
[12] Roman was booked to challenge the reigning WBA "World" super-bantamweight champion in the latter's first title defense.
The bout was booked for September 3, 2017, as the main event of Showtime's "ShoBox: The New Generation", and took place at the Shimadzu Arena in Kyoto, Japan.
Roman dropped and cut Kubo above the left eye thirty seconds into the seventh round.
Kubo flagged in the ninth round, and failed to respond to Roman's flurry of punches, which prompted referee Pinit Prayadsab to stop the fight.
[16] On December 19, 2017, it was announced that Roman would make his first world title defense against the #13 ranked WBA super-bantamweight contender Ryo Matsumoto.
The bout was scheduled as the main event of a card which took place at the Korakuen Hall in Tokyo, Japan.
[18] On March 17, 2018, the WBA ordered Roman to make his second title defense against the undefeated Moises Flores, and gave both parties 30 days to negotiate the terms of the fight.
McDonnell was able to beat the ten count, but was unsteady on his feet, which promoted referee Mark Nelson to wave the fight off.
[28] The fight was officially announced for April 26, 2019, to take place at The Forum in Inglewood, California, and to be broadcast by DAZN and Sky Sports.
[32] The fight was scheduled as the co-featured bout of a DAZN broadcast card, which took place on January 20, 2020, at the Meridian at Island Gardens in Miami, Florida.
[37] Roman was scheduled to face Juan Carlos Payano on the undercard of The Charlos vs. Derevyanchenko and Rosario on September 26, 2020.