Boxer Robert Guerrero listens to comments during a news conference, Wednesday, May 1, 2013, in Las Vegas. Guerrero will challenge Floyd Mayweather Jr. for Mayweather's WBC welterweight title on Saturday. (AP Photo/Julie Jacobson)

Associated Press
Boxer Robert Guerrero listens to comments during a news conference, Wednesday, May 1, 2013, in Las Vegas. Guerrero will challenge Floyd Mayweather Jr. for Mayweather's WBC welterweight title on Saturday. (AP Photo/Julie Jacobson)
Boxer Robert Guerrero listens to comments during a news conference, Wednesday, May 1, 2013, in Las Vegas. Guerrero will challenge Floyd Mayweather Jr. for Mayweather's WBC welterweight title on Saturday. (AP Photo/Julie Jacobson)
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