Oscar Collazo (boxer)

Collazo vs. Jerusalem

On January 30, 2023, the WBO ordered their mini-flyweight champion Melvin Jerusalem make a mandatory title defense against Collazo.^[17] As they failed to reach a deal within the 30-day negotiation period, the sanctioning body scheduled a purse bid for February 23.^[18] It was declared deserted for failure to comply with purse bid terms, rescheduled for February 27,^[19] and eventually won by Golden Boy Promotions and Cotto Promotions with a bid of $152,000.^[20] The championship bout took place at the Fantasy Springs Casino in Indio, California on May 27, 2023.^[21] Collazo won the fight by stoppage in the seventh round, as Jerusalem remained on his stool at the start of the eighth round. He became the fastest fighter from Puerto Rico to win a world title belt, overtaking Alex Sánchez who captured his first title 11 fights into his professional career.^[22]

Collazo vs. Diagan

Collazo made a voluntary championship defense against the ninth-ranked WBO mini-flyweight contender Garen Diagan, who was making his first world title challenge, on August 26, 2023, at the Roberto Clemente Coliseum in San Juan, Puerto Rico.^[23][24] It was the first men's world title fight in Puerto Rico in six years and Collazo's first fight in his home country since 2021. The bout was broadcast worldwide by DAZN.^[25][26] Collazo won the fight by a seventh-round technical knockout, as Diagan's corner chose to withdraw their fighter from the contest in between the rounds.^[27] He was ahead on all three of the judges' scorecards at the time of the stoppage, with two scorecards of 60–54 and one scorecard of 58–56 in his favor.^[28]

Collazo vs. Gutierrez

On December 30, 2023, it was announced that Collazo would make his second WBO mini-flyweight championship defense against an unnamed opponent on the undercard of the Jaime Munguia and John Ryder super middleweight bout, which is expected to take place at the Footprint Center in Phoenix, Arizona on January 27, 2024.^[29] On January 17, 2024, it was confirmed that Collazo would face Reyneris Gutierrez.^[30]

On Saturday January 27, 2024, Collazo defeated Gutierrez via third-round TKO and made the second successful defense of his belt.^[31]

Collazo vs. Zapata

On April 5, 2024, Golden Boy Promotions announced that Collazo would make his next WBO mini-flyweight championship defense against the once-defeated Gerardo Zapata. The main event title bout took place at the Turning Stone Resort Casino in Verona, New York on June 7, 2025 and was broadcast worldwide by DAZN.^[32][33] Oscar Collazo retained his WBO strawweight title by overcoming an early scare to secure a lopsided unanimous decision victory over Gerardo Zapata. After being rattled and nearly knocked down by a heavy right hand in the second round, Collazo regained control by utilizing superior footwork and quick-fisted flurries. He ultimately dominated the later rounds to win comfortably on the scorecards, with two judges scoring the bout 119–109 and the third 117–110.^[34]

Collazo vs. Knockout CP Freshmart

Collazo faced Knockout CP Freshmart for the unified WBO, WBA, and the inaugural The Ring minimumweight titles on November 16, 2024 in Riyadh, Saudi Arabia.^[35][36][37] He won the bout by stoppage in the seventh round.^[38][39]

Collazo vs. Cano

Collazo then defended his unified titles against Edwin Cano in Cancun, Mexico on March 29, 2025.^[40] He won by KO in the fifth round. Following the win, he received the WBO ring, which is given to titleholders who make five successive defenses. Collazo stated this was one of his goals when he first won the WBO title.^[41]

On May 23, 2025, Collazo said he was open to having a rematch with Melvin Jerusalem, who had called Collazo out after winning his recent bout. Jerusalem had also picked up the WBC belt since his loss to Collazo in 2023.^[42]

Collazo vs. Vayson

On August 10, 2025, Golden Boy Promotions announced a double-header to take place on September 20 at Fantasy Springs Resort Casino in Indio, California on DAZN, with Collazo and undisputed women's flyweight champion Gabriela Fundora both defending their titles on the same card; Collazo would defend his titles against Filipino boxer Jayson Vayson (14–1–1, 8 KOs), while Fundora's defense against Alexas Kubicki would serve as the co-main event.^[43] Vayson was on a four-fight win, with three of them inside the distance. Speaking ahead of the fight, Collazo said, “We will enter the ring very prepared, with a lot of boxing IQ. We know Vayson is a great fighter and that he will be hungry to dethrone me, but he won’t be able to, because I have worked hard to defend what is mine and represent my island with pride.”^[44][45]

Despite the fight being more challenging than anticipated, Collazo successfully defended his titles with a seventh-round stoppage, with some controversy.^[46] Collazo scored a controversial first-round knockdown, which replays indicated was due to a forearm rather than a clean punch. Vayson’s body shots caused Collazo trouble, particularly in the fourth round. In the sixth round, Collazo increased his pressure, landed combinations, pushing Vayson against the ropes. He continued this into the next round. Despite Vayson appearing able to continue, his corner unexpectedly threw in the towel at 1:41 of the seventh round, resulting in a technical knockout for Collazo. Despite being pressed against the ropes and absorbing significant shots, Vayson showed resilience and effective counterpunching throughout the fight. At the time of stoppage, all three judges had it 59–54 for Collazo.^[47][48][49] The stoppage was widely debated. Many observers noted that Vayson seemed able to continue and was still competitive, leading to criticism of his corner for ending the fight prematurely. Vayson felt that he was capable of carrying on but respected his corner’s decision.^[50][51]

After the fight, he spoke to Chris Mannix, stating his main goal was to add more titles at the weight—however, he would not rule out a move up to flyweight against WBA and WBC champion Ricardo Sandoval. His focus was to become the first male Puerto Rican undisputed champion.^[52][53]

Following the retirement of Terence Crawford, Collazo entered The Ring magazine's top 10 pound-for-pound list at number 10 on 24 December 2025, his highest ranking yet.^[54]

Collazo vs. Haro

After plans for a rematch with Jerusalem fell through, Collazo instead faced Mexican-American Jesus Haro (13–3, 2 KOs) on Anaheim, CA, as the co-feature to the Arnold Barboza Jr. vs. Kenneth match on March 14, 2026.^[55] The bout was intended as a stay-busy fight for Collazo, who intended to finalize the Jerusalem rematch for the summer should he defeat Haro.^[56] Despite Haro initially being evasive, the fight proved to be a mismatch, as Collazo eventually wore down his opponent with body shots en route to a sixth-round corner retirement, producing the first stoppage loss in Haro's career. Interviewed after the bout, Collazo stated his intention of reaching The Ring's top five pound-for-pound rankings. With this win, the rematch with Jerusalem was expected to move forward should Jerusalem successfully defend against Siyakholwa Kuse on May 16.^[57]

Collazo vs. Valdez

Collazo's next fight was announced on May 29, 2026 by Golden Boy Promotions, to take place at the Frontwave Arena in Oceanside, California. He was scheduled to defend his title against Joey Canoy (25–5–2, 15 KOs) on June 20 on DAZN Canoy was entering the fight on a long unbeaten streak dating back to 2021. He was challenging for a major world title for the first time in his career.^[58][59] During fight week, it was reported that Canoy withdrew from the bout after failing to secure the necessary work visa to enter the United States. Promoters submitted a request for Mexican contender Luis Castillo (22-1-1, 14 KOs) to serve as a late replacement. The WBO announced that it would hold a special meeting to determine whether Joey Canoy would be replaced. Their Ratings and Championship Committee was tasked with reviewing the request and ruling on Castillo’s eligibility. The request was put forward by co‑promoter Miguel Cotto.^[60][61] Replacing Canoy with Castillo also proved unsuccessful due to similar visa issues. Mexican contender Neider Valdez (15–3–3. 12 KOs) was secured as a late replacement on short notice. Valdez, who entered the bout with mixed recent form, was widely regarded as a less proven opponent. There was uncertainty about whether the WBA and WBO would sanction the fight.^[62] Collazo was listed as an 80-1 favorite by DraftKings. The WBA refused to sanction the bout, however, the WBO approved sanctioning it. The title defense was altered to a non-title bout. Valdez was unable to make the 105-pound limit. As a result, the contest was moved up to the flyweight division, with both fighters weighing above the minimumweight threshold. Collazo weighed 110.6 pounds and Valdez weighed 111.2 pounds.^[63][64] Collazo sent Valdez to the canvas three times before the referee stepped in and halted the fight in the second round.^[65][66] Following the fight, Collazo stated his intention to move up in weight and pursue a bout with unified flyweight champion Ricardo Sandoval, describing himself as ready to “make history,” while promoter Oscar De La Hoya also endorsed the potential matchup as a leading fight in the division.^[67]