, thus giving Marquez an additional $ 600,000 on top of his $ 3.2 million guarantee for the fight at the MGM Grand Garden Arena . The 32-year-old Mayweather , who returns to the boxing ring for the first time since December 2007 when he beat Ricky Hatton to retain his WBC world welterweight championship , has a reported minimum guarantee of $ 10 million before pay-per-view TV revenues are added . Mayweather is undefeated with a career record of 39-0 , while the 36-year-old Marquez , who holds the WBA and WBO world lightweight belts , has 50 victories from 55 fights , 37 by knockout . Meanwhile , Nikolai Valuev will defend his WBA heavyweight title against British boxer David Haye in Germany on November 7 . The fight , originally announced in July , had been in doubt as American John Ruiz lodged a legal challenge claiming that he was the giant Russian 's mandatory challenger . However , the 36-year-old 's promoters have clinched a deal with Ruiz , meaning the bout can go ahead as planned at Nuremberg 's Arena Nurnberger Versicherung , where Valuev beat Sergei Liakhovich in February 2008 . The 7 '
-LRB- CNN -RRB- -- Floyd Mayweather Jr will have to pay Juan Manuel Marquez a reported $ 600,000 after weighing in two pounds too heavy ahead of Saturday night 's welterweight showdown in Las Vegas . Floyd Mayweather Jr , left , faces off with Juan Manuel Marquez ahead of Saturday night 's fight . Fight promoters Golden Boy confirmed after Friday 's weigh-in that there had been a contractually agreed weight of 144 pounds for Mayweather 's comeback bout , and that the American would pay a stipulated -- but undisclosed -- amount for every pound over that amount . As it was , Mayweather tipped the scales at 146 pounds and Mexican Marquez , whose usual weight is around 135 pounds , was weighed at 142 as he stepped up from lightweight for the fight . The maximum for a welterweight is 147 pounds . `` The fight was contracted as a welterweight fight with an agreed upon weight of 144 pounds . However , there were pre-negotiated weight penalties built in , '' Golden Boy CEO Richard Schaefer told ESPN.com . The website also reported sources who stated that each extra pound would cost Mayweather $ 300,000