I think his win over Arguello was big upset... So what were Vilomar's odds? Was he 5-1 underdog or higher? Nothing about it...
Not sure there would have been odds being a non-title 10-rounder. Vilomar could box for sure. His fight against Howard Davis Jr is a good watch.
Whatever the odds were, he was a massive underdog coming in. He was at least a known quantity having challenged Duran the year before and not done badly. But even though Arguello was testing the waters at lightweight, it was huge surprise him losing.
https://www.nytimes.com/1978/07/27/archives/fernandez-and-escalera-victors-in-garden-bouts.html No odds mentioned the day after.
His fight against the great Alexis Arguello was a non title 10 rounder, but he demonstrated good boxing skills and movement. That was a weakness for Alexis, it also gave Roberto Duran trouble until round 13 on January 29 1977, Duran caught up to Vilomar, to successfully defend his WBA Lightweight Title.
