By Scott Ploof, Pat Kelley & Bill Luppert at ringside; Unbeaten former junior welterweight Ricky Hatton (41-0, 30 KOs) stepped up to welterweight and won the WBA title, dethroning Luis Collazo (26-2, 12 KOs) by unanimious decision Saturday night at the TD Banknorth Garden in Boston, Mass. Although Hatton dropped Collazo in the first ten seconds of the bout, the matchup was a sytlistic nightmare for "The Hitman" and many rounds could have gone either way. Hatton tried to crowd Collazo early on, ripping savage hooks to the body. The southpaw Collazo, however, stood his ground landing sharp punches himself. Collazo was cut on the forehead by an unintentional headbutt in round three, but champion slowly managed to get Hatton's respect and he began to outbox the now less aggressive challenger. Hatton amped up his aggression in the seventh, taking away Collazo's jab with intense pressure. Hatton's left eye was almost closed entering the tenth round, and Colozzo was able to keep the fight at his distance in that round. Round eleven was fought at close quarters with Hatton on the attack. Entering the last round it could have been anyone's fight and both fighter's landed big shots. Collazo landed a series of shots that sent Hatton reeling. Hatton later came back with a strong left hook. In the end, the scores were 115-112, 115-112, 114-113.