Las Vegas: Floyd Mayweather Jr. cemented his place among the pantheon of boxing greats with a unanimous decision over fellow American Andre Berto on Saturday in what he has repeatedly said would be the final fight of his career.

Mayweather, 38, outboxed his younger opponent over the 12 rounds to retain his WBC and WBA welterweight titles and improve his perfect career record to 49-0, matching the benchmark set by former heavyweight champion Rocky Marciano.