Floyd Mayweather Jr retained his unbeaten status, winning his rematch with Marcos Maidana in a unanimous decision in Las Vegas.
The American's professional record was extended to 47-0, while Maidana's slipped to 35-5 as Mayweather retained his WBA and WBC welterweight titles as well as the WBC junior middleweight belt.
The judges scored the 12-round bout 115-112, 116-111 and 116-111.
Mayweather edged the opening three rounds despite hitting the canvas in the first, as he allowed Maidana the middle of the ring but used his feet to get the fight on his own terms.
The local favourite did not have the entire crowd in his corner at the MGM Grand, with plenty of Argentine support for the challenger.
And Mayweather showed signs of frustration in the eighth round, claiming Maidana bit him on the glove, forcing referee Kenny Bayless to separate the pair momentarily.
But it would be as close as Maidana came to upsetting the undefeated champion, as Mayweather comfortably negotiated the final rounds.