When the two biggest names in prizefighting square off in a boxing ring on Aug. 26 in Las Vegas, there's potential for Floyd Mayweather and Conor McGregor to break financial and pay-per-view records.

In what's expected to be nothing short of a combat sports carnival, Mayweather and McGregor will face off for the first time next week in a four-city international press tour stretching across three countries and a pair of continents. Showtime Sports, which will broadcast the fight on PPV, announced the tour Friday.

The festivities begin Tuesday, July 11 in Los Angeles at the Staples Center with subsequent stops on Wednesday in Toronto (Sony Centre for the Performing Arts), Thursday in Brooklyn, New York (Barclays Center) and Friday in London (The SSE Arena at Wembley).

All four events are open to the public although free tickets will be distributed on a first-come, first-served basis and will be limited to four per customer.

McGregor, 28, the reigning UFC lightweight champion, grabbed the mantle from a retired Mayweather in recent years as the biggest star in combat sports. Along with an impressive streak of knockout victories inside the Octagon, which included becoming the first UFC fighter to hold titles in separate weight divisions simultaneously, McGregor (21-3 in MMA; 9-1 in UFC) elevated his name to an international level due to his ability to market fights with his mouth.

Even the most ardent critics of the fight, who remain skeptical about McGregor's chances of being remotely competitive with Mayweather inside a boxing ring, are expecting next week's press tour to be the highlight of the entire event and promotion. McGregor's quick wit and outlandish behavior has been compared to the late Muhammad Ali.

Mayweather, 40, returns to the sport he walked away from as the pound-for-pound king and best of his era for the first time since late 2015. After defeating Andre Berto to improve to 49-0, equaling the storied mark of former heavyweight champion Rocky Marciano, Mayweather retired on top.

Both fighters have broken (and in some cases shattered) PPV records in their respective sports. McGregor holds three of the top five records for highest-selling UFC fights while Mayweather holds the top three in boxing, including a record 4.6 million buys against Manny Pacquiao in their 2015 superfight.

Ticket information for the Toronto and London events have yet to be released. For Tuesday's Los Angeles press conferences, fans can obtain tickets by going to AXS.com beginning on July 7 at noon PT. For the Brooklyn event, fans can obtain them now at ticketmaster.com, along with in person at the American Express Box Office at Barclays.