WBC interim super middleweight champion Lester Martinez will enter the ring on August 29 to make the first defense of his title against undefeated Croatian challenger Luka Plantic. ProBox TV announced the bout on Thursday, marking a significant step for the 168-pound division as the Los Angeles area prepares to host the championship clash.
An official press conference is scheduled for Monday in Carson, California, where reporter Francisco Salazar indicates the specific venue and broadcast details will be formally unveiled.
Rise of Guatemala’s first major world champion
Martinez, a 30-year-old native of Guatemala, carved his name into the history books in March 2026. By defeating Immanuwel Aleem via a unanimous decision with scores of 120-108, 118-110, and 119-109, he became the first fighter from his nation to capture a world title recognized by one of boxing’s four major sanctioning bodies.
Now, he faces Luka Plantic, a high-ranking contender who has built a perfect professional record in Europe and is looking to secure a major upset in his North American debut.
Lester Martinez has transitioned from a decorated amateur career to a professional standout with an undefeated record of 20-0-1. Standing 5′ 11″ with a 72-inch reach, the Petén-born fighter has finished 16 of his opponents, boasting an 80% knockout ratio.
Key details
His path to the WBC interim strap included notable victories over seasoned veterans like Carlos Gongora and Joeshon James, proving his ability to navigate the upper echelons of the super middleweight class.
One of the defining moments of his recent career was a September 2025 split draw against Christian Mbilli. The ten-round war was widely regarded as a “Fight of the Year” candidate, highlighting the Guatemalan’s durability and skill against top-tier opposition.
Since that encounter, Martinez has continued to sharpen his tools under the guidance of trainer Brian ‘Bomac’ McIntyre. While many fighters find their progress hindered when a boxing match is delayed by contract talks elsewhere in the sport, Martinez has remained active, making this his second appearance of 2026.
The champion’s technical evolution has been evident in his recent outings. He has moved beyond relying solely on raw power, demonstrating a disciplined jab and better ring generalship. Under McIntyre’s corner leadership, Martinez has shown he can maintain a high pace over 12 rounds, a necessity when facing a relentless challenger like Plantic who thrives on volume and physical pressure.
Luka Plantic and the European challenge
For Luka Plantic, the August 29 date represents a massive jump in class and his first professional appearance outside of Europe. The 29-year-old Croatian, born in Zagreb and residing in Solin, brings a 13-0 record with 10 knockouts to the table.
Currently ranked #3 by the WBC, Plantic is not a typical challenger; he possesses an extensive amateur background that includes a bronze medal at the 2022 European Amateur Boxing Championships and silver at the 2014 Youth World Boxing Championships.
Plantic’s style relies on a “bully” approach, often using his 5′ 11½” frame to crowd opponents and work the body. This will be the first time he faces an opponent with the caliber and power of Martinez.
Key details
While some observers believe Mbilli presents a challenge for Canelo, Plantic views this interim title fight as his own gateway to that elite conversation. A victory would boost his standing and potentially make him a mandatory challenger for the full WBC title.
The significance of this fight for Croatian boxing is substantial. Plantic is looking to follow in the footsteps of national legends like Mate Parlov, and a win in Los Angeles would instantly raise his global profile.
He enters the contest with a 76.92% knockout ratio, suggesting that despite the jump in competition, he has the power to keep the champion honest throughout the night. ProBox TV, founded by Garry Jonas, is expected to handle the broadcast, putting Plantic under the brightest lights of his career.
WBC rankings and the broader super middleweight landscape
The timing of this defense is particularly strategic within the super middleweight ecosystem. The winner of Martinez vs. Plantic will naturally keep a close eye on Riyadh, where undisputed champion Christian Mbilli is scheduled to defend his titles against Saul “Canelo” Alvarez on September 12.
As the interim champion, Martinez holds a position of leverage; if he wins, he could potentially set up a high-stakes rematch with Mbilli or a lucrative showdown with the winner of the September mega-fight.
The division continues to see rapid shifts in its hierarchy. Much like how Rolando Romero was elevated in a different weight class to keep the gears of the sanctioning bodies moving, the WBC super middleweight rankings are in a state of constant motion.
This bout ensures that the interim title remains active, preventing a logjam at the top of the 168-pound rankings while the undisputed champion is occupied with other mandatory or high-profile commitments.
Key details
As the August 29 date approaches, the technical battle lines are clearly drawn. Martinez remains a patient, orthodox stalker who uses a 72-inch reach to set up punishing combinations. His ability to handle 12 rounds was demonstrated against Aleem, and he will likely try to exploit Plantic’s tendency to come forward by landing heavy counters.
For the champion, the key is maintaining distance and not allowing the Croatian to turn the fight into a rugged inside battle.
Plantic, conversely, must utilize his slightly superior height to find angles that Martinez hasn’t seen in his previous American bouts. His amateur pedigree suggests he has the footwork to reset, but his professional average fight length of six rounds is significantly shorter than Martinez’s championship experience.
All eyes now turn to the Monday press conference in Carson, where the final promotional details will solidify what is shaping up to be a pivotal night for the 168-pound division.
