Floyd Mayweather Jr. weighed in at 146 pounds Friday, one under the limit, for his welterweight title defense Saturday against Robert “The Ghost” Guerrero at MGM Grand in Las Vegas (on Showtime pay-per-view).

Guerrero tipped the scales at the 147-pound limit.

The weigh-in took place before several thousand. Mayweather is 43-0 with 26 knockouts. Guerrero is 31-1-1 with 18 knockouts.