8 rounds

Ulises
Duarte
VS
Francisco
Sierra

Sierra · KO 2/8

May 21, 2011 · Arena Jorge Cuesy Serrano, Tuxtla Gutierrez, 🇲🇽

Duarte going in—

Sierra going in23-3-1

Confirmation✓ one source

MethodKO

Round2 of 8

Sources

English Wikipedia
side b · observed 2026-10-11
en.wikipedia.org/wiki/Francisco_Sierra_(boxer)

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