Richard Torrez dealt well with the figurative and literal biggest challenge of his career Saturday night in Las Vegas. The aggressive, undersized southpaw started strong, made adjustments that neutralized Guido Vianello’s strategic changes in the middle rounds and won their 10-round heavyweight bout by unanimous decision. Torrez’s right hook was his most consistent weapon and helped convince judges Tim Cheatham (97-92), Max De Luca (98-91) and Steve Weisfeld (98-91) that he won the main event of a nine-bout card at Palms Casino Resort’s Pearl Theater.