LAS VEGAS — Floyd Mayweather Jr. won a unanimous decision over Manny Pacquiao on Saturday night, using his usual skill to remain unbeaten in the most anticipated fight in recent years. Mayweather (48-0) won comfortably on all three judges' scorecards in his long-awaited showdown with Pacquiao (57-6-2). Despite boos from a pro-Pacquiao crowd at the MGM Grand Garden Arena, Mayweather counterpunched and jabbed his way to another win.