Brazilian fighters win in each of the top four bouts, though one comes with controversy
Mayweather said injured hand kept him from knocking out Guerrero
Mayweather predicts Robert Guerrero is 'going away to do time after this fight'
- Floyd Mayweather Jr. questions if Robert Guerrero is on his level to start fight week
- Chael Sonnen contemplating retirement after failed title bid at UFC 159
- UFC 159 live blog: Jon Jones proves point in quickly dispatching Chael Sonnen
- UFC 159 weigh-in: Chael Sonnen offers bold closing remarks
- From timid striker to knockout brute, Roy Nelson hopes to stay on tear at UFC 159