They said 1/10. They said formality. They forgot that Angel “Tashiro” Fierro spent years in the same gym, throwing the same punches at the same training partner, learning the same timing and the same patterns. Oscar “La Migrana” Duarte retained the WBA World Super Lightweight title at T-Mobile Arena — but he didn’t retain it cleanly. He needed a split decision, three judges, and the kind of championship heart that only shows up when a fight stops going to plan.
| Winner | Oscar Duarte (ret.) |
| Method | Split Decision |
| Title | WBA World Super Lightweight (retained) |
| Venue | T-Mobile Arena, Las Vegas |
| Date | May 2–3, 2026 |
A 1/10 favourite means the sportsbooks expect this fight to be decided well before three judges need to weigh in. A split decision means at least one of those judges thought the underdog won more rounds. Fierro weaponised his stablemate knowledge from the opening bell, disrupting Duarte’s rhythm in a way no amount of film study could replicate.
The stablemate dynamic produced exactly what fight historians would have predicted: an aggressive, high-tempo, technically scrappy contest where neither man could rely on the usual advantages of surprise. Fierro knew Duarte’s best shots were coming. What separated them — narrowly, on two judges’ cards — was conditioning and championship experience.
Duarte’s body work, which typically pays dividends in Rounds 4-7, wasn’t landing with the clean accumulation he needs. Fierro’s guard adjustment — presumably drawn from sparring intelligence about exactly when and where those hooks arrive — was absorbing impact that, against other opponents, has broken fighters down. One judge’s scorecard suggests Fierro was actually ahead at the midpoint.
What changed in the second half was feet. Duarte’s conditioning edge — 30-fight champion built for 12-round wars — started to show from Round 8. Fierro’s output dropped, his counter timing slowed, and the body work that had been deflected earlier began to accumulate. Duarte pulled away on two cards, but the one judge who saw it differently wasn’t wrong to have Fierro in it until the end.
Duarte at 1/10 winning by split decision is one of the more statistically surprising outcomes on a Cinco de Mayo card in recent memory. This isn’t the first time stablemate fights produce closer contests than talent differentials predict. Fierro exploited that variable as well as anyone could have asked.
| Fighter | Record | KOs |
|---|---|---|
| Oscar Duarte (W) | 31-2-1 | 23 |
| Angel Fierro (L) | 23-4-2 | 18 |
For Duarte, the IBF super lightweight unification fight remains the target. For Fierro, this performance earns a second look — a fighter who takes a 1/10 favourite to a split decision in a world title fight is not one who disappears to the regional circuit.
For the full Cinco de Mayo card, see our Benavidez vs Zurdo fight review and Munguia vs Resendiz fight review.
How did Duarte vs Fierro end? Oscar Duarte retained the WBA World Super Lightweight title by split decision over 12 rounds.
Why was the fight so close? Fierro and Duarte are former stablemates. Fierro’s intimate knowledge of Duarte’s style neutralised many of La Migrana’s usual advantages, especially the body work that typically defines his finishes.
What is Duarte’s record after this fight? Oscar Duarte improved to 31-2-1 with 23 knockouts.
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