BOXING: Floyd Mayweather Jr is 5-1 favourite to add Argentinian Carlos Baldomir's World Boxing Council welterweight title to his collection of championship belts in Las Vegas tonight.

But although the unbeaten Mayweather is widely regarded as the best pound-for-pound boxer in the world, the unheralded Baldomir is in confident mood.

"Nobody has ever expected me to win, and that's fine. I will show not only why I won the belt but why I will leave the ring with it," he predicted.

Although Baldomir has nine losses on his ledger, he has gone undefeated in 21 bouts since 1998. He is also the largest opponent Mayweather has faced. A natural welterweight, he reportedly weighs up to 180 pounds between bouts. Baldomir upset Zab Judah to win the title last January.