It's official. Pacquiao and Marquez, who have combined to win 12 world championships, will meet for the fourth time on December 8, 2012 at the MGM Grand in Las Vegas.

Congressman Manny Pacquiao and four-time world champion Juan Manuel Marquez, recognized as two of the best pound for pound fighters in the world will begin a three-city tour this Monday, September 17, at Rodeo Lounge the Beverly Hills Hotel (Sunset Blvd, Beverly Hills, California) to announce the fourth match of their rivalry.

Among those present are both fighters’ coaches Freddie Roach and Ignacio Beristain. Also in attendance are Canastota Boxing Hall of Famer Todd duBoef, president of Top Rank and Fernando Beltran, president of Zanfer Promotions.

The tour will continue in New York on Wednesday and end on Friday in Mexico City.