Britain's Amir Khan gave Luis Collazo a boxing lesson in Las Vegas, easily outpointing his American opponent in his first fight as a welterweight.
Khan was too fast and too disciplined for the ponderous Collazo, flooring him in the fourth and twice in the 10th.
The judges scored the fight 117-106, 119-104, 119-104 in Khan's favour.
The win puts Khan back on track for a dream fight with American legend Floyd Mayweather, who fights Marcos Maidana on the same card at the MGM Grand.
However, the 27-year-old Khan is unlikely to fight Mayweather in September because it is too close to the end of the month-long Muslim fasting of Ramadan.