A fan rally for Juan Manuel Marquez at noon Sunday at Olvera Street in downtown Los Angeles will kick off the three-city promotional tour for the Mexican star’s fight against Floyd Mayweather Jr. on July 18 in Las Vegas.

Marquez will be joined by prospect Victor Ortiz and other Mexican-American fighters at the event, which will be open to all fans.

That event will be followed by an outdoor, open-to-the-pubic news conference featuring both fighters at 2 p.m. in front of the Los Angeles Public Library, Central Library (400 S. Hope St.).

The tour will then move to New York City, where a news conference for members of the media only is scheduled for 11:30 a.m. Tuesday at the Empire State Building, which will include a photo session on the 86th-floor observatory.

The fighters will then fly to London, where a media-only news conference is set for 2 p.m. Thursday at the Landmark Hotel. Mayweather will have an open-to-the-public workout at the East London Boxing Gym the following afternoon. The time hasn’t been determined.

Mayweather, the former pound-for-pound king, will have been out of the ring for 19 months when he fights Marquez at the MGM Grand. The fight will be televised live on HBO Pay Per View.

“Now that Floyd is back, we need to let the world know it,” said Leonard Ellerbe, CEO of Mayweather Promotions. “The fight against Marquez will be one to remember, and I am looking forward to getting on the road so the media and the fans can really get a sense of how great July 18 will be for the sport of boxing.”