Las Vegas, Nevada --- Undefeated former world champion Yuriokis Gamboa shadow boxes during a public workout in the lobby of the MGM Grand for his upcoming WBA Interim Super Featherweight Championship fight against Michael Farenas of the Philippines on the undercard of Manny Pacquiao vs Juan Manuel Marquez. Promoted by Top Rank®, in association with MP Promotions, Zanfer Promotions, Márquez Boxing, Tecate, Wonderful Pistachios, Cinemax ‘Banshee,’ Smart Communications, Universal Pictures ‘Django Unchained’ and MGM Grand Hotel & Casino, Pacquiao vs Marquez 4 will be produced and distributed live by HBO Pay Per View from the MGM Grand in Las Vegas on Saturday, Dec. 8. --- Photos by Chris Farina/Top Rank.