LAS VEGAS- Unbeaten Floyd Mayweather returns to the ring after a year's absence that included a jail stint on Saturday, risking his World Boxing Council welterweight title against southpaw Robert Guerrero. Mayweather, 43-0 with 26 knockouts, went to jail last June for domestic violence and since his release eight months ago has been working to regain the fitness needed to defend his place atop the list of boxing's moneymakers. "I feel unbeatable," Mayweather said. "I'm in tip top condition. I'm in great shape. I have been working hard. I just call it a vacation." American Guerrero, 31-1 with 18 knockouts and a 15-fight win streak dating to 2005, wants to humble Mayweather by inflicting the first loss of his career.–AFP