Oscar Collazo is 13-0 with 10 knockouts. He holds the WBO, WBA Super, and Ring Magazine titles at strawweight — 105 pounds, the smallest weight class in professional boxing. He won the 2019 Pan American Games gold medal. He was five-time national amateur champion of Puerto Rico. He is on the Ring Magazine pound-for-pound top ten list. He was compared to Roman "Chocolatito" Gonzalez by people in Puerto Rico who know what that comparison means. Oscar De La Hoya stood next to him at a press conference and asked why he isn't in the top two pound-for-pound in the world.
And you almost certainly have never heard of him. Not because he isn't great. Because he fights at 105 pounds — and most casual boxing fans stop watching somewhere around lightweight, if they watch boxing at all.
"The minimumweight is below the others, and a lot of people don't see us. I'm making a difference. That's my mentality every time: go in the ring and give a phenomenal performance to make people notice me."
— Oscar Collazo, pre-fight media workout, March 2026Puerto Rican boxing is having an extraordinary moment right now — René Santiago won unified junior flyweight titles in December 2025; Xander Zayas won unified junior middleweight titles in January 2026. Tonight, Collazo is the third simultaneous Puerto Rican unified champion defending his belts. Three unified champions from one island at the same time. For anyone who understands what Puerto Rico has contributed to the sport of boxing — from Wilfredo Gómez to Félix Trinidad to Miguel Cotto — this moment is historic.
76% Collazo's knockout rate — 10 stoppages in 13 fights 7 Consecutive title defenses of his WBO belt — one of the most active champions in boxingJesus Haro is 13-3. He is a California-bred counter puncher who fights on the back foot, waits for openings, and makes opponents pay for recklessness. He is not the favorite tonight. He knows this. He was asked to take this fight with almost no notice. He had been driving back from Reno a month ago, running on the road, when he thought about what might have happened if he'd taken a previous Collazo fight offer. Two days later, the phone rang.
Haro spent his childhood training. He was one of California's best amateurs. The transition to the professional ranks was harder than the amateur pedigree suggested it would be — three losses that came as reality checks, not as defining defeats. He rebuilt. He repositioned. And now he's here, at the Honda Center in Anaheim — close enough to home that his people will be in the building — fighting for world titles against a man some are comparing to Chocolatito.
"Why be in this sport if you don't want to fight the best? People are going to be shocked and remember my name."
— Jesus Haro, pre-fight interview with BoxingScene, March 2026Collazo has already identified the tactical problem. "He's a counter boxer. He's always fighting on the back foot. That's what we like. We like to apply pressure on these type of fighters and just show them who's the big dog." Collazo is telling you exactly how he intends to fight. The question for Haro is whether the pressure Collazo brings — the same pressure that stopped Edwin Cano in 5, Thammanoon Niyomtrong in 7, and Jayson Vayson in 7 — can be withstood long enough for the counter shots to land. He believes they can. The betting line disagrees significantly.
Gold at the 2019 Pan American Games. Five national amateur titles in Puerto Rico. Won the WBO belt in his seventh professional fight. Unified the WBA and Ring Magazine belts in his 11th fight — by knocking out former champion Thammanoon Niyomtrong in the 7th round in Riyadh, Saudi Arabia. Made six consecutive title defenses since. His most recent: TKO7 of Jayson Vayson in September 2025. He is on a three-fight knockout streak. He has not gone the full 12 rounds since winning the unified belts. Collazo is the active lineal champion at strawweight — the man who beat the man — and he is actively chasing an undisputed championship by targeting WBC titleholder Melvin Jerusalem and IBF titleholder Pedro Taduran, both of whom have been reluctant to schedule the fight. Tonight is described by his camp as a "stay-busy" defense before the Jerusalem rematch.
Do not let the term "stay-busy" deceive you. Collazo is 13-0 because he has treated every fight like the most important of his career. His mentality has never changed. He is, right now, a pound-for-pound level talent fighting in a weight class most casual fans never watch. If you are in the building tonight and you miss this fight to get popcorn, you are missing something extraordinary.
The Gem Watch fighter of this card. Jesus Haro was one of California's finest amateurs. The professional journey has been harder — three losses, a career recalibration, a path that led him to tonight not through dominance but through persistence and a refusal to take the easy road. One month ago, he was running in Reno wondering what might have happened if he'd taken a Collazo fight earlier. Two days after that thought, his phone rang with exactly this opportunity.
He is a counter boxer who fights off the back foot — the stylistic profile that Collazo says he loves, because it means the pressure game is wide open. The dangerous counter puncher who waits and picks his spots is the opponent that can make a pressure fighter look desperate. Haro's job is to survive the early rounds, make Collazo miss enough times to find his own rhythm, and then land the counter shots that have ended other fighters' confidence. He will need everything he has. But he showed up. Not every fighter would.
| Collazo | Category | Haro |
|---|---|---|
| Oscar "El Pupilo" Collazo | Fighter | Jesus Haro |
| 13-0 | Record | 13-3 |
| 10 (76%) | KOs | 2 (15%) |
| WBO · WBA · Ring Mag | Titles Held | None · Challenger |
| Villalba, Puerto Rico | Hometown | California |
| 29 (born Jan 15, 1997) | Age | — |
| Pressure fighter · Relentless · Body attack | Style | Counter boxer · Back foot · Waits for openings |
| 2019 Pan American Games Gold · 5× Puerto Rico National Champ | Amateur Pedigree | California amateur standout |
| TKO7 Niyomtrong · KO5 Cano · TKO7 Vayson · 3-fight KO streak | Recent Form | Won 3 of last 4 · 2 stoppage wins |
| Jerusalem (WBC) · Taduran (IBF) — undisputed run next | What Winning Means | World champion. First title. The dream since fight one. |
| Ring Magazine Top 10 P4P · Compared to Chocolatito | The Ceiling | Upset of the year candidate |
Arnold Barboza Jr. has been a professional boxer for twelve years. In those twelve years — 33 fights, across three weight classes, through every level of the sport — he lost exactly once. It was the right man to lose to: Teofimo Lopez, one of the most dangerous fighters in the sport, at 140 pounds in the middle of Times Square in New York City, for the WBO and Ring Magazine super lightweight world championships. Barboza lost that fight by unanimous decision on May 2, 2025. And then he did what most fighters can't do after finally getting the title shot they spent a decade earning and coming up short — he reset.
New team. New gym. New mindset. He is moving up in weight to welterweight — 147 pounds, a weight class he hasn't competed at since his very first professional bout in 2013. He is 34 years old. He is starting over in the same weight class where he began. And he is saying something remarkable about the loss that cost him everything: "My first loss didn't break me; it built me."
"I'm officially stepping back into the ring after some much-needed time off. My first loss didn't break me; it built me. Built a new team, new gym, new mindset, yet still the same purpose, same hunger, same goals."
— Arnold Barboza Jr., pre-fight statement, February 2026Barboza's record before that loss is one of the most quietly impressive in recent boxing: 32-0, wins over Jack Catterall in Manchester, Jose Carlos Ramirez in Riyadh, Sean McComb at Barclays Center, Alex Saucedo, Mike Alvarado. He traveled the world and beat quality fighters. He did it the right way. The loss to Lopez removed his ranking insulation at 140. Tonight at 147, he needs to re-establish himself from the ground up.
Kenneth "Bossman" Sims Jr. was born on Christmas Day, 1993. His father — also Kenneth Sims — took him to the boxing gym when he was eight years old, not because young Kenneth loved boxing, but because his father wanted him to know how to defend himself. For years, the trophies were the only reason the kid stayed. Around 16, something shifted. He found his identity in the sport.
He became a nine-time US national amateur champion. He represented Team USA at the 2013 World Championships in Kazakhstan. In the 2012 US Olympic Trials — the fight that could have put him on the path to London — he lost by a single point to a fighter named Jose Ramirez. Jose Ramirez, who would eventually become a unified super lightweight world champion. Sims lost to the right guy. He just didn't know it yet.
"I view myself as a 'thinking' boxer. Stylistically, sitting down on my punches and increasing my power is something I've been working on. My opponents rarely rush in on me anymore — it's working."
— Kenneth "Bossman" Sims Jr., kennethsimsjr.comHis professional career had early stumbles — two losses and a draw that forced a serious reckoning. He and his father analyzed what was wrong and rebuilt. In May 2021, as a massive +1200 underdog, Sims executed a cerebral masterclass against unbeaten Elvis Rodriguez over eight rounds, winning the majority decision and introducing his methodical, IQ-driven style to a wider audience. He has never been stopped in 26 professional fights. He trains with his father on the Southside of Chicago. He is, by his own accounting, always the most patient fighter in the ring.
+1200 Sims's betting odds when he upset unbeaten Elvis Rodriguez in 2021 — a defining moment 0 Times Sims has been stopped in 26 professional fights
His pro career started at 147 pounds in 2013. He spent the next 12 years moving down to super lightweight, building to the title shot everyone knew was coming. Wins over Jose Carlos Ramirez — a former two-belt champion — in Riyadh. A split decision over Jack Catterall in Manchester to win the WBO Interim belt. Then Times Square. Teofimo Lopez. Unanimous decision. One loss. And now: a new team, a new gym, a new mindset, and a return to welterweight.
His technical approach and ring IQ have never been questioned — it's what made him a 32-fight unbeaten prospect and then a genuine world title contender. At 34, moving up in weight after absorbing the most physically demanding fight of his career against Lopez, the question is not about skill. It's about what the body and mind can produce after climbing the mountain and not reaching the summit. "Same purpose, same hunger, same goals." The fight card tonight is his first test of whether those words are true.
Born Christmas Day. Trained by his father from age 8. Lost the 2012 Olympic Trials to Jose Ramirez by one point — the same Jose Ramirez who became a unified world champion. Two professional losses early in his career led to reflection and rebuilding. Then the Elvis Rodriguez upset at +1200 in Las Vegas — the majority decision over an unbeaten fighter that announced "Bossman" to the sport. First professional belt, then a second. Then a loss to Oscar Duarte in Chicago in August 2025.
Sims fights from a longer position than his 68.9-inch reach suggests he should — he is technically the shorter-armed fighter against Barboza's 72-inch reach, which will be a factor in distance management. He is a thinking boxer who views the ring as a chess match. He has never been stopped. He trains on the Southside of Chicago with his father, who understands exactly how this fight needs to be fought because he taught the fighter how to think. The family operation that built him from a reluctant eight-year-old into a US national champion and professional contender is still fully intact.
| Barboza Jr. | Category | Sims Jr. |
|---|---|---|
| 32-1 | Record | 22-3-1 |
| 11 KOs (34%) | Stoppage Power | 8 KOs (36%) |
| 72 inches | Reach | 68.9 inches (Sims shorter) |
| 5'9" | Height | 5'10" |
| 34 years old | Age | 32 years old |
| Orthodox | Stance | Orthodox |
| Technical · High ring IQ · Counter/combo boxer | Style | Patient · Cerebral · Counter boxer · Thinking fighter |
| Ramirez (UD) · Catterall (SD) · Saucedo (UD) · Alvarado (KO3) | Best Wins | Elvis Rodriguez (+1200 upset) · Batyr Akhmedov · Montana Love |
| UD12 loss to Teofimo Lopez for WBO/Ring title · May 2025 | Last Loss | MD12 loss to Oscar Duarte · August 2025 |
| Welterweight debut — first time at 147 since fight 1 in 2013 | Division Context | Established welterweight contender · #5 WBA ranking |
| Longer reach — should control distance | Physical Edge | Taller — better angles at close range |
| Can he recapture title contender status at 147? | Key Question | Can cerebral chess-match boxing neutralize Barboza's technical edge? |
The Honda Center card tonight is richer than its billing suggests. The co-main event features a genuine pound-for-pound caliber fighter that most of the boxing world has never seen. The main event features a 12-year professional who started over after his first loss. And the undercard has a former world title challenger in JoJo Diaz fighting to reclaim relevance. These are the fighters worth watching with a scout's eye.
He's 13-0 with 10 KOs. Ring Magazine top 10 pound-for-pound. Gold at the Pan American Games. Compared to Chocolatito by people who watched Chocolatito. And you've probably never seen him fight — because he fights at 105 pounds and most casual fans have never watched a strawweight bout. That ends tonight. If Collazo fights the way he has been fighting, you will leave the arena or close your DAZN tab wanting to know everything about him.
He drove back from Reno a month ago and thought about what might have been if he'd taken a Collazo fight earlier. Two days later the phone rang. He said yes immediately. "Why be in this sport if you don't want to fight the best?" That is the single most important thing you need to know about Jesus Haro before this fight begins. He showed up. He believes. And in the strawweight division — where one counter shot can alter everything — he is more dangerous than his record suggests.
Twelve years of professional boxing. One loss. A title shot against Teofimo Lopez. "My first loss didn't break me; it built me." Starting over at 147 with a new team and a new gym at age 34. That is either the setup for a final chapter or the beginning of a second act. The first round tonight will tell you which version of Barboza showed up. If the jab is sharp and the feet are moving, the second act is real.
Born Christmas Day. Lost the Olympic Trials by ONE point to a future world champion. Upset Elvis Rodriguez at +1200. Nine-time US national champion. Never been stopped. Trained by his father on the Southside of Chicago since age 8. The "Bossman" has built his career the hard way — through losses, rebuilds, and a patience that makes him one of the most dangerous stylistic challenges in the division for a counter-punching opponent. If he wins tonight, it's the biggest statement win of his career.
Joseph "JoJo" Diaz was a world champion. He held the IBF super featherweight title. He was a 2012 US Olympic team member. A personal battle with addiction publicly cost him years of prime fighting time. He is fighting tonight on the undercard against Alexis Rocha — a dangerous welterweight. For the scout watching the undercard: this is a former elite fighter in the middle of a redemption arc. If the tools are still there, the story writes itself.
René Santiago won unified junior flyweight titles in December 2025. Xander Zayas won unified junior middleweight titles in January 2026. Oscar Collazo defends unified strawweight titles tonight. Three Puerto Rican unified world champions simultaneously. For anyone who knows what boxing has meant to that island — from Wilfredo Gómez to Félix Trinidad to Miguel Cotto — tonight is not just a fight. It is a continuation of a sporting legacy. Collazo fights for all of it.
Somewhere at 105 pounds, Oscar Collazo is doing something extraordinary that most boxing fans will never see because they stopped watching at lightweight. Tonight at the Honda Center, you have the chance to fix that. He is going to walk Jesus Haro down, apply relentless pressure, and try to do what he has done in ten of his thirteen professional fights: stop the man across from him. Haro is going to make him work for every inch of it.
And in the main event, a fighter who spent twelve years doing everything right and then lost the biggest fight of his life is going to tell you — in the only language boxing understands — whether he meant what he said. "My first loss didn't break me; it built me." Arnold Barboza Jr. throws his first jab of the first round tonight, and we'll know.
Story First Blueprint · Official Fight Card Program · Fight Night Anaheim
Honda Center · Anaheim, California · March 14, 2026 · DAZN
Sources: BoxRec.com · BoxingScene.com · BoxingNews24.com · GoldenBoy.com · KennethSimsJr.com
ESPN Boxing Schedule · Wikipedia · FightsATW.com · Box.Live · Boxing247.com
Records and stats verified from BoxRec and multiple published sources as of March 14, 2026.