Mosley made the first defense of his unified WBC, WBA Super and The Ring Magazine world light middleweight titles on March 13, 2004 against IBF champion Ronald Wright (46-3, 25 KOs) at the Mandalay Bay Resort & Casino in Las Vegas. Prior to taking this bout, Mosley turned down an offer to fight Félix Trinidad in a bout that would have seen him receive $10 million. Wright, who was a 5-to-2 underdog, won the fight via a unanimous decision. Judges Dave Moretti and Chuck Giampa scored it 117-111, while Paul Smith had it 116-112 all in Wright's favor. In the fast-paced bout, Mosley was unable to get on the inside. Wright's southpaw stance made it difficult for him, as he threw jabs and straight left to both the face and body of Mosley. CompuBox stats shows that Wright out landed Mosley landing 250 punches to 166 from Mosley. In the post-fight interview, Mosley said about the Trinidad fight being in jeopardy, "It was not a mistake. I have no regrets. I wanted to find out who was the best in our division. I was fighting for history." Mosley earned $2.1 million, while Wright was paid $750,000.