Arnold Allen is set to face Melquizael Costa in the headline bout of UFC Fight Night on May 16, 2026, emanating from the Apex in Las Vegas. The featherweight clash will cap off an evening of fights, with preliminary bouts commencing at 6 p.m. ET and the main card beginning at 9 p.m. ET.

Allen, a seasoned competitor, enters the octagon with a professional record of 20 wins and 4 losses, boasting 7 knockout victories, 4 submission wins, and 9 decisions. His opponent, Costa, holds a more extensive record of 26 wins against 7 defeats, with 9 of his victories coming by way of knockout and 8 by submission.

Betting Analysis and Odds

Initial betting lines opened with Arnold Allen as a -150 favorite and Melquizael Costa as a +130 underdog. As betting has progressed, the market has shown increased confidence in Allen, with his odds tightening to a range of -160 to -190, while Costa’s odds have shifted to +140 to +165 across various bookmakers. Specialized betting markets offer insights into specific outcomes, listing Allen by decision at odds of 1.67-2.50, and by KO/TKO or submission at 3.60. Costa is priced at 3.00-4.50 for a decision victory and 4.33 for a finish.

The total rounds market suggests a lean towards a longer fight, with odds for the bout to go over 4.5 rounds trading between 1.57 and 1.67, while under 4.5 rounds is priced at 2.05-2.20. Predictive models currently place Allen’s win probability between 59% and 60%.

Fighter Breakdown and Path to Victory

Arnold Allen’s experience against top-tier opponents is a significant factor. Despite recent losses to top contenders like Holloway and Evloev, Allen has demonstrated the ability to compete at a high level. His previous nine-fight win streak in the UFC, prior to his 2023 setbacks, underscores his capability. His path to victory is often dictated by maintaining a controlled pace throughout the fight.

Costa’s underdog status is largely attributed to Allen’s striking proficiency. Allen lands an average of 3.47 significant strikes per minute with 42% accuracy, while defending 60% of his opponents’ strikes. His takedown game averages 0.86 per 15 minutes with 47% accuracy and strong 71% defense.

Allen’s recent performances include a unanimous decision loss to Jean Silva on January 24, 2026, preceded by a win over Giga Chikadze in July 2024. Notable past victories include a stoppage of Calvin Kattar due to injury in 2022 and a knockout win against Dan Hooker in the same year.

Melquizael Costa, standing at 5’10”, tends to be involved in shorter contests, averaging just 9:11 per fight. His UFC record stands at 7 wins and 2 losses, with 2 knockouts, 2 submissions, and 3 decisions. While specific details of his recent UFC victories are less readily available, Costa has proven his ability to finish opponents.

Betting Angles and Predictions

This matchup presents a classic betting scenario: a proven favorite against a dangerous underdog. Allen’s extensive resume and experience in five-round championship fights are weighed against Costa’s higher-risk, higher-reward fighting style. Allen’s increasing favoritism in the odds reflects his established durability and consistent output over extended periods.

For bettors favoring Allen, props related to him winning by decision and the fight going over 4.5 rounds appear to be the most logical angles, anticipating his pace and experience to prevail over time. Costa’s finishing ability and shorter fight averages present him as a live underdog, particularly in the earlier rounds. Those seeking higher volatility might find value in Costa’s odds for a knockout or decision victory.

As the fight week progresses, the betting market generally expects Arnold Allen to secure a victory, likely on the judges’ scorecards, re-establishing his position in the featherweight division. However, the odds still provide an opening for those who believe Costa can transform the main event into a chaotic and unpredictable brawl that could upset more conservative betting strategies.

English Translation and Reframed Text

UFC Fight Night: Arnold Allen is the Favorite Against Melquizael Costa

Arnold Allen is scheduled to face Melquizael Costa in the main event of UFC Fight Night on May 16, 2026, taking place at the Apex in Las Vegas. This featherweight bout will headline the card, with preliminary fights starting at 6 p.m. ET and the main card commencing at 9 p.m. ET. Allen enters the contest with a professional record of 20 wins and 4 losses, including 7 knockouts, 4 submissions, and 9 decisions. Costa boasts a record of 26 wins and 7 defeats, with 9 knockouts and 8 submissions to his name.

Arnold Allen vs Melquizael Costa Odds and Analysis

The initial betting odds favored Allen at -150, with Costa at +130. The lines have since shifted, with Allen now considered a stronger favorite, ranging from -160 to -190, while Costa’s odds have moved to between +140 and +165 across various sportsbooks. Savvy bettors are identifying specific outcomes, with Allen to win by decision priced between 1.67 and 2.50, and by KO/TKO or submission at 3.60. Costa is listed at 3.00-4.50 for a decision win or 4.33 for a finish.

The odds for the fight to go over 4.5 rounds are trading at 1.57-1.67, suggesting an expectation for a longer bout, while the under 4.5 rounds is priced at 2.05-2.20. Prediction markets estimate Allen’s probability of winning at 59-60%.

Allen possesses a clear advantage in experience against highly-ranked opponents, having demonstrated his capability against fighters like Holloway and Evloev despite his losses. His path to victory often involves controlling the fight’s tempo. He secured nine consecutive UFC victories before facing setbacks in 2023, though he rebounded with a win against Chikadze.

Costa’s underdog status reflects Allen’s superior striking statistics, as Allen lands an average of 3.47 significant strikes per minute against opponents who tend to have lower output. Betting on round outcomes suggests Allen is favored in the later stages, with odds of 17.00-23.00 for rounds 3-5. Costa winning by decision at 4.50 could offer value for bettors anticipating a grinding performance from him.

Allen, a 5’8″ southpaw from England with a 70-inch reach, averages 3.47 significant strikes per minute at 42% accuracy and defends 60% of his opponents’ strikes. His average takedown rate is 0.86 per 15 minutes with 47% accuracy and 71% defense. His recent record includes a unanimous decision loss to Jean Silva on January 24, 2026, following a win over Giga Chikadze in July 2024. He previously defeated Calvin Kattar via knee injury in 2022 and Dan Hooker by strikes that same year.

Costa, standing at 5’10”, typically participates in shorter fights, averaging 9:11. His UFC record is 7-2, with 2 KOs, 2 submissions, and 3 decisions. While specific details of his latest UFC wins are less prominent, he has shown a capacity for finishing fights.

From a betting perspective, this fight is framed as a “trusted favorite versus a live underdog.” Allen’s extensive experience and proven ability to go five rounds are pitted against Costa’s more aggressive, high-risk, high-reward style. Allen’s increasing moneyline odds align with his demonstrated durability and striking output over 25 minutes, making bets on him to win by decision and the fight to exceed 4.5 rounds the most sensible options for those expecting his pace and experience to be decisive.

Costa’s finishing rate and shorter average fight times still give him upset potential, especially early in the fight. His odds for a KO or a decision win will appeal to bettors seeking greater variance. As the week progresses, the market anticipates Allen to reassert himself in the featherweight division with a controlled, scorecard-driven victory. However, the odds provide enough room for those who believe Costa can turn this main event into a chaotic fight that challenges conservative betting predictions.