Floyd Mayweather Jr. has fought only four times since coming out of a near-two-year retirement with a September 2009 fight against Juan Manuel Marquez. That’s four fights in more than 3 1/2 years. Moreover, when Mayweather squares defends his welterweight title against Robert “The Ghost” Guerrero on Saturday at MGM Grand in Las Vegas (on Showtime pay-per-view), it will be a  year almost to the day since his most recent fight – against Miguel Cotto at MGM Grand.

Guerrero wonders if the inactivity is finally going to catch up to Mayweather.

“… Floyd Mayweather having a year off and being in jail and stuff like that, it takes a toll on you,” Guerrero said. “No matter what you do, you do have a little ring rust. It’s different from training and sparring, then getting in the fight, so that ring rust is always there until you actually get in that ring and shake it off.”

Mayweather (43-0, 26 KOs) spent two months in Clark County Detention Center after his May 5 bout with Cotto for a domestic abuse conviction.