He was the first fighter to win world titles in eight weight classes, but none of that mattered Saturday.
The championships continue Friday with the quarter and semifinals, setting up a Saturday night finals for all 10 weight classes.
The two lightest-weight classes for the men and the women are on the line this weekend, and Japan should medal in each.
Oddsmakers don't share Guerrero's confidence, making the former champion in three weight classes a decided underdog in the biggest fight of his career.
It wasn't until 1986 that boxing was allowed again after authorities realized its many weight classes could aid the country's pursuit of Olympic medals.
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Mayweather, a former champion of five weight classes whose 2007 bout with De La Hoya drew a record 2.4 million PPV buys, hasn't dropped any public hints on whether he'll stay retired.
He worked with the Nevada State Athletic Commission to get UFC sanctioned in Nevada after adopting some rules: There would be weight classes, judges, point systems and a limited number of rounds.
Then she does a mix of cardio and weight-resistance classes on Tuesday, Thursday and Saturday.
Each tournament is broken down into different weight and age classes, from the junior competition (those under 21) to the highly-anticipated heavyweight class (any weight above 88kg).
The weight loss has also inspired Hill to take acting classes, and she's even appeared as an extra in several movies.
She says she has quit smoking and enrolled in diabetes-education classes, which are helping her exercise and lose weight.
Members of the group taking monthly classes were mailed the same material as those who attended classes weekly, and those who failed to meet weight-loss goals could get individual counseling by phone or in person.
After spending years trying to lose weight, she now focuses instead on being healthy and fit and teaches 10 aerobics classes a week.
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These range from the number of calories burned in sexual activity to the value of physical education classes to the notion that burning 3, 500 extra calories leads mathematically to a one-pound weight loss.
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