[1] Collazo won the WBA Welterweight title on April 2, 2005, with a 12-round split decision victory over defending champion Jose Antonio Rivera.
Baldomir had chosen to pay the sanctioning fee of the WBC only; as a result Judah's WBA undisputed title was vacated.
On February 10, 2007, he lost a 12-round unanimous decision versus Sugar Shane Mosley in which he injured his hand early in the fight and continued on till the end.
After working back from the injury through rehab and aggressive training, by long-time trainer Nirmal Lorick, Luis fought on the Roy Jones Jr. vs. Félix Trinidad card, January 19, 2008, at Madison Square Gardens.
On September 28, 2008, on the Mosley vs. Mayorga undercard, Collazo stopped Russell Jordan (now 15-6) in the eighth and final round of their bout.