Martinez (20-0-1, 16 KOs), the WBC interim 168-pound titleholder and The Ring’s No. 4-rated fighter in the weight class, is set to return August 29 against Luka Plantic (13-0, 10 KOs) in a 12-round fight to headline a ProBox TV event at a Los Angeles venue still to be determined, it was announced on Thursday.

In the co-main event, Najee Lopez (16-0, 13 KOs), The Ring’s No. 7-ranked light heavyweight contender, returns from his Fight of the Year candidate and eighth-round stoppage win in March against Manuel Gallegos to take on 2016 Colombian Olympian Juan Carrillo (15-0, 11 KOs).

Junior featherweight contender Ramon Cardenas (27-2, 15 KOs), ranked No. 5 by The Ring at 122 pounds, is also slated to be featured on the show against an opponent still to be determined.

Martinez last fought in March and picked up the interim title he now holds with a one-sided unanimous decision win against Immanuwel Aleem at the Orange Show Events Center in San Bernardino, California. The matchup marked Martinez’s first outing since engaging in a majority-draw war with Christian Mbilli in September.

Mbilli was the WBC interim champion at the time and became the full titleholder in December, after undisputed king Terence Crawford was stripped of the WBC belt shortly before retiring following his September win over Canelo Alvarez. Mbilli has since moved on to a scheduled clash against Alvarez on September 12 in Saudi Arabia.

Martinez, a 30-year-old from Guatemala, should be in a prime position to eventually meet the winner if his outing against Plantic ends without a hitch.

Plantic is ranked No. 3 by the WBC and No. 13 by the IBF but has never broken through outside of the European boxing circuit. The 29-year-old Croatian last fought in November, stopping the previously unbeaten Shadiri Musa Bwogi in nine rounds.

Manouk Akopyan is The Ring’s lead writer. Follow him on X and Instagram: @ManoukAkopyan.