Showtime Boxing have announced this evening that two world championship titles fights have been added to the Conor McGregor vs. Floyd Mayweather undercard.

The main event will of course feature the Irish UFC lightweight champion Conor McGregor taking on the 49-0 undefeated boxing great, Floyd Mayweather.

The co-main event announced earlier today will feature the youngest current U.S. boxing champion Gervonta “Tank” Davis, who will defend his IBF Junior Lightweight World Championship against undefeated challenger Francisco Fonseca.

The first world title defended on the card will feature WBA Light Heavyweight Titlist Nathan Cleverly defending his title against former 168-lbs world champion Badou Jack “The Ripper” who will be stepping up a weight class.

Opening up the pay-per-view card will be Andrew “The Beast” Tabiti taking ontwo-time world champion Steve “U.S.S.” Cunningham for the USBA cruiserweight title in a fight scheduled for ten, three-minute rounds.

Speaking via press release, Leonard Ellerbe, CEO of Mayweather Promotions, promised it was going to be an unforgettable night for boxing fans.

What a night this will be for fight fans,” Ellerbe said. “Not only will they witness a first of its kind main event, but they will also see two incredible world title fights, as Mayweather Promotions’ very own current and former world champions go head-to-head in separate bouts. Gervonta Davis is nothing short of pure boxing talent with dynamite power.

“Former super middleweight world champion Badou Jack is making his light heavyweight debut, and looking to take the title away from a tough and experienced Nathan Cleverly. But first, Andrew “The Beast” Tabiti will open the pay-per-view telecast with what I expect to be a magnificent performance. This diverse card is an epic, international affair stacked with talent. Make sure you don’t miss the biggest event the sport has ever seen.”

“This undercard includes three meaningful matches featuring fighters we’ve seen develop over the years on SHOWTIME,” added Stephen Espinoza, Executive Vice President and General Manager of Showtime Sports. “Gervonta Davis has fast-tracked himself to stardom on this network, we’ve seen Badou Jack develop from prospect to champion, and we’re now witnessing similar growth with Andrew Tabiti. We’re excited to watch them compete in tough, competitive matchups on this global stage.”

Mayweather vs. McGregor Fight Card

Conor McGregor (0-0) x Floyd Mayweather (49-0-0 26 KOs)

Gervonta Davis (18-0, 17 KOs) x Francisco Fonseca (19-0-1, 13 KOs) – IBF Junior Lightweight World Championship

Nathan Cleverly (30-3, 16 KOs) x Badou Jack (21-1-2, 12 KOs) – WBA Light Heavyweight World Championship

Andrew Tabiti (14-0, 12 KOs) vs. Steve Cunningham (29-8-1, 13 KOs) – USBA Cruiserweight Title