LAS VEGAS, Nevada - Floyd Mayweather overwhelmed Shane Mosley by unanimous decision to remain unbeaten on Saturday, then vowed he will not fight Manny Pacquiao unless the Filipino star accepts his blood test plan.

Mayweather was staggered early but dominated the last 10 rounds to win by judges' scores of 119-109, 119-109 and 118-110, the 33-year-old American improving to 41-0 while dropping 38-year-old countryman Mosley to 46-6.

"My ultimate goal was to box early and start pressing the attack later in the fight," Mayweather said. "I should have started pressing the attack earlier. Perhaps we could have gotten the knockout."