At the weigh in both men came in under the 130lb meaning the bout will take place as planned, and at stake isn't just honour but also WBC International Silver Super Featherweight title, with Gonzalez looking to make the third defense of the title.
The Mexican, a clear betting favourite, is expected to retain the title that he won last December, when he over-came Hurricane Futa in a "tougher than the score-cards suggested" bout. Since then he has scored back to back stoppages over Justin Savi and Christopher Martin.
As for Yamamoto the bout will be his third title bout, after coming up short for the WBC Asian Boxing Council Super Featherweight title in 2010 and the WBO Asia Pacific Super Featherweight title last year. A win for the visitor would be career defining, but also a huge upset with no one giving him much of a chance.
(Image courtesy of Pepe Rodriguez)