it against Filipino boxer Jimrex Jaca with a nine-round knockout in Hidalgo, Texas. Márquez was promoted to world champion status in December 2006 when previous champion Scott Harrison vacated the title. Márquez vacated the Featherweight title the following year to challenge WBC Super Featherweight Champion Marco Antonio Barrera. Super featherweight Márquez vs. Barrera On March 17, 2007, Márquez became the WBC Super Featherweight Champion by defeating Barrera in Las Vegas via unanimous decision, by the official scores of 116–111, 116–111 and 118–109. Márquez's first defense of his title was to be held on September 15, 2007, against Argentinian boxer Jorge Rodrigo Barrios. However, Barrios withdrew from the bout due to injury, prompting American boxer Rocky Juárez to challenge Márquez for the title on November 3, 2007, in a losing effort. Márquez vs. Pacquiao II On November 29, 2007, Márquez announced that he would defend his title in a rematch with Pacquiao. On March 15, 2008, Márquez lost his Super Featherweight title to Pacquiao via split decision. Márquez suffered a knockdown in the third round that proved to be the difference, as the remaining rounds were scored dead even. Compubox scoring had Márquez landing 42 of 201 (21%) jabs to Pacquiao's 43 of 314 (14%) and landing 130 of 310 (42%) power punches to Pacquiao's 114 of 305 (37%). Richard Schaefer, Golden Boy Promotions CEO, offered a $6 million guarantee to Pacquiao for a rematch. Pacquiao's promoter, Bob Arum, said, "I'm not saying they'll never fight again, but you have to let it bake for a while." Pacquiao said: "I don't think so, this business is over" as he planned to move up to the lightweight division. Lightweight Márquez vs. Casamayor Márquez moved up to the lightweight division in order to fight The Ring Lightweight Champion Joel Casamayor on the weekend leading up to Mexican Independence Day at the MGM Grand, Las Vegas, Nevada. On September 13, 2008, he defeated Casamayor in the 11th round after two knockdowns and captured his sixth world title in three different weight classes. In the first four rounds of the bout, Márquez continually walked into counter punches from Casamayor. It took Márquez until the fifth round to be able to find the range with his right hand. By the fifth round, a cut over Casamayor's right eye was opened from a clash of heads. Rounds five, six, seven and eight were rounds where Márquez landed