Arnold Allen is set to face Melquizael Costa in the main event of UFC Fight Night on May 16, 2026, at the Apex in Las Vegas. The featherweight bout will headline the card, with preliminary fights commencing at 6 p.m. ET and the main card starting at 9 p.m. ET. Allen brings a professional record of 20 wins (7 by knockout, 4 by submission, 9 by decision) into the octagon, while Costa holds a record of 26 wins (9 by knockout, 8 by submission) against 7 losses.
Arnold Allen vs. Melquizael Costa: Betting Analysis
Initial betting lines saw Allen as a -150 favorite and Costa as a +130 underdog. These odds have since shifted, with Allen’s advantage widening to between -160 and -190, while Costa’s odds now range from +140 to +165. This movement suggests growing confidence in Allen among bettors. Specific prop bets indicate that Allen winning by decision is favored at odds of 1.67-2.50, with a finish for Allen priced at 3.60. Costa winning by decision is offered at 3.00-4.50, and a Costa finish is at 4.33. The betting market also anticipates a fight that goes the distance, with odds for the fight to exceed 4.5 rounds ranging from 1.57-1.67, while under 4.5 rounds is between 2.05-2.20. Prediction markets currently place Allen’s win probability between 59% and 60%.
Arnold Allen has a notable advantage in experience against high-level competition, having performed well against top-15 opponents like Max Holloway and Islam Makhachev, even in his losses. His path to victory is expected to be dictated by his consistent pace. Prior to recent setbacks in 2023, Allen had secured nine consecutive victories in the UFC, including a notable win over Giga Chikadze in his last outing. Costa’s underdog status is attributed in part to Allen’s superior striking output, with Allen landing an average of 3.47 significant strikes per minute compared to his opponents’ generally lower output. Round-specific props favor Allen in the later rounds, with odds for rounds 3-5 ranging from 17.00 to 23.00. However, Costa winning by decision at 4.50 could represent value if he manages to control the fight’s tempo.
Allen, a 5’8″ southpaw from England with a 70-inch reach, averages 3.47 significant strikes per minute with 42% accuracy and defends 60% of his opponents’ strikes. His takedown offense averages 0.86 per 15 minutes with 47% accuracy, and he boasts a 71% takedown defense. His recent performances include a unanimous decision loss to Jean Silva on January 24, 2026, preceded by his victory over Giga Chikadze in July 2024. Before that, he secured impressive finishes against Calvin Kattar (via knee injury TKO) and Dan Hooker (via punches) in 2022. Costa, standing at 5’10”, tends to be involved in shorter fights, averaging 9:11 of octagon time. His UFC record stands at 7-2, with 2 knockouts, 2 submissions, and 3 decision victories. While specific details of his most recent UFC wins are less readily available, he has demonstrated significant finishing ability.
From a betting perspective, this matchup presents a classic scenario of a seasoned favorite against a dangerous underdog. Allen’s extensive fight resume and proven ability to go the distance in five-round bouts are pitted against Costa’s higher-risk, higher-reward fighting style. The widening odds in favor of Allen reflect his perceived durability and consistent output over a full fight, making decision props and betting on the fight to go over 4.5 rounds attractive options for those who believe his experience and pace will prevail. Costa’s finishing ability and shorter average fight duration still offer upset potential, particularly in the early stages of the fight, making his knockout or decision odds appealing to bettors seeking more volatile outcomes. As the fight week progresses, the market consensus leans towards Allen securing a methodical, scorecard-driven victory to re-establish his position in the featherweight division. However, the odds still leave room for those who believe Costa can turn the main event into a chaotic slugfest that could upset more conservative betting strategies.