LAS VEGAS — Floyd Mayweather Jr. put on a virtuoso display of boxing skill in an unanimous decision over Sugar Shane Mosley on Saturday night, keeping his perfect record intact.

Mayweather gave a masterful effort in his most dangerous fight in several years against the 38-year-old Mosley, who put Mayweather on his heels with several rocking punches in the second round. Mayweather regained his composure and thoroughly outboxed the veteran champion.

Mosley didn’t have the power or precision to follow up his dynamic second round, losing in his first fight since stopping Antonio Margarito in January 2009.

Mayweather accepted this fight when negotiations with Manny Pacquiao broke down over Mayweather’s drug-testing demands. He could fight Pacquiao later this year.