Mayweather, UFC star McGregor agree to August fight

June 14 (Reuters) - Undefeated boxer Floyd Mayweather and mixed martial arts champion Conor McGregor, two of the most popular athletes in their respective sports, have agreed to a crossover fight in the ring on August 26 in Las Vegas, Mayweather said in a tweet on Wednesday.

The fight is expected to gross millions of dollars with Mayweather a solid favorite.

Mayweather, 40, retired in 2015 with an unblemished 49-0 professional boxing record while boastful Irishman McGregor, 28, is the UFC's lightweight champion.

28 PHOTOS
UFC champion Conor McGregor
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UFC champion Conor McGregor
NEW YORK, NY - NOVEMBER 09: UFC Featherweight Champion Conor McGregor takes part in UFC 205 Open Workouts at Madison Square Garden on November 9, 2016 in New York City. (Photo by Michael Reaves/Getty Images)
Nov 12, 2016; New York, NY, USA; Conor McGregor (blue gloves) celebrates with his two championship belts after defeating Eddie Alvarez (red gloves) in their lightweight title bout during UFC 205 at Madison Square Garden. Mandatory Credit: Adam Hunger-USA TODAY Sports
Northern Ireland , Ireland - 19 November 2016; UFC Lightweight and Featherweight champion Conor McGregor at UFC Fight Night 99 in the SSE Arena, Belfast. (Photo By David Fitzgerald/Sportsfile via Getty Images)
BELFAST, NORTHERN IRELAND - NOVEMBER 19: (L-R) Artem Lobov of Russia celebrates with teammate and UFC champion Conor McGregor after his featherweight bout against Teruto Ishihara during the UFC Fight Night at the SSE Arena on November 19, 2016 in Belfast, Northern Ireland. Lobov defeated Ishihara by unanimous-decision. (Photo by Brandon Magnus/Zuffa LLC/Zuffa LLC via Getty Images)
New York , United States - 17 March 2017; UFC Lightweight Champion Conor McGregor during an interview in The Theater in Madison Square Garden in New York, USA. (Photo By Ramsey Cardy/Sportsfile via Getty Images)
NEW YORK, NY - NOVEMBER 12: UFC featherweight champion Conor McGregor of Ireland warms up backstage at Madison Square Garden prior to his lightweight championship fight agianst Eddie Alvarez during the UFC 205 event on November 12, 2016 in New York City. (Photo by Brandon Magnus/Zuffa LLC/Zuffa LLC via Getty Images)
NEW YORK, NY - NOVEMBER 12: Conor McGregor of Ireland celebrates his victory over Eddie Alvarez in their UFC lightweight championship fight during the UFC 205 event at Madison Square Garden on November 12, 2016 in New York City. (Photo by Brandon Magnus/Zuffa LLC/Zuffa LLC via Getty Images)
NEW YORK, NY - NOVEMBER 12: UFC featherweight and lightweight champion Conor McGregor of Ireland poses for a picture during the UFC 205 post fight press conference at Madison Square Garden on November 12, 2016 in New York City. (Photo by Brandon Magnus/Zuffa LLC/Zuffa LLC via Getty Images)
NEW YORK, NY - NOVEMBER 12: Conor McGregor of Ireland celebrates his KO victory over Eddie Alvarez of the United States in their lightweight championship bout during the UFC 205 event at Madison Square Garden on November 12, 2016 in New York City. (Photo by Jeff Bottari/Zuffa LLC/Zuffa LLC via Getty Images)
NEW YORK, NY - NOVEMBER 12: Conor McGregor of Ireland warms up in his locker room prior to his lightweight title fight against Eddie Alvarez during the UFC 205 event at Madison Square Garden on November 12, 2016 in New York City. (Photo by Ed Mulholland/Zuffa LLC/Zuffa LLC via Getty Images)
NEW YORK, NY - NOVEMBER 12: Eddie Alvarez of the United States (right) fights against Conor McGregor of Ireland in their lightweight championship bout during the UFC 205 event at Madison Square Garden on November 12, 2016 in New York City. (Photo by Jeff Bottari/Zuffa LLC/Zuffa LLC via Getty Images)
NEW YORK, NY - NOVEMBER 12: Conor McGregor of Ireland warms up in his locker room prior to his lightweight title fight against Eddie Alvarez during the UFC 205 event at Madison Square Garden on November 12, 2016 in New York City. (Photo by Ed Mulholland/Zuffa LLC/Zuffa LLC via Getty Images)
NEW YORK, NY - NOVEMBER 11: (R-L) Conor McGregor of Ireland and Eddie Alvarez face off during the UFC 205 weigh-in inside Madison Square Garden on November 11, 2016 in New York City. (Photo by Brandon Magnus/Zuffa LLC/Zuffa LLC via Getty Images)
NEW YORK, NY - NOVEMBER 11: UFC Featherweight Champion Conor McGregor reacts during UFC 205 Weigh-ins at Madison Square Garden on November 11, 2016 in New York City. (Photo by Michael Reaves/Getty Images)
NEW YORK, NY - NOVEMBER 10: UFC featherweight champion Conor McGregor of Ireland interacts with fans and media during the UFC 205 press conference inside The Theater at Madison Square Garden on November 10, 2016 in New York City. (Photo by Mike Roach/Zuffa LLC/Zuffa LLC via Getty Images)
NEW YORK, NY - SEPTEMBER 27: UFC featherweight champion Conor McGregor of Ireland interacts with the media and fans during the UFC 205 press event at Madison Square Garden on September 27, 2016 in New York City. (Photo by Jeff Bottari/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - AUGUST 20: (L-R) Nate Diaz and Conor McGregor of Ireland embrace after finishing five rounds in their welterweight bout during the UFC 202 event at T-Mobile Arena on August 20, 2016 in Las Vegas, Nevada. (Photo by Jeff Bottari/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - AUGUST 20: (R-L) Nate Diaz punches Conor McGregor of Ireland in their welterweight bout during the UFC 202 event at T-Mobile Arena on August 20, 2016 in Las Vegas, Nevada. (Photo by Jeff Bottari/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - AUGUST 20: Conor McGregor waits for the start of his welterweight rematch against Nate Diaz at the UFC 202 event at T-Mobile Arena on August 20, 2016 in Las Vegas, Nevada. McGregor won by majority decision. (Photo by Steve Marcus/Getty Images)
LAS VEGAS, NV - AUGUST 20: Conor McGregor of Ireland prepares to walkout prior to facing Nate Diaz in their welterweight bout during the UFC 202 event at T-Mobile Arena on August 20, 2016 in Las Vegas, Nevada. (Photo by Jeff Bottari/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - AUGUST 20: (2nd L-R) Mixed martial artist Conor McGregor, golfer Rory Mcllroy and singer Niall Horan celebrate McGregor's UFC 202 victory during the official after-fight party at Intrigue Nightclub at Wynn Las Vegas on August 20, 2016 in Las Vegas, Nevada. (Photo by David Becker/Getty Images for Wynn Las Vegas)
LAS VEGAS, NV - AUGUST 20: (L-R) Conor McGregor punches Nate Diaz in their welterweight bout during the UFC 202 event at T-Mobile Arena on August 20, 2016 in Las Vegas, Nevada. (Photo by Brandon Magnus/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - AUGUST 20: Conor McGregor of Ireland fights Nate Diaz in their welterweight bout during the UFC 202 event at T-Mobile Arena on August 20, 2016 in Las Vegas, Nevada. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
Sep 27, 2014; Las Vegas, NV, USA; Conor McGregor (blue gloves) fights Dustin Poirier (red gloves) during a featherweight fight during UFC 178 at MGM Grand Garden Arena. Mandatory Credit: Stephen R. Sylvanie-USA TODAY Sports
Sep 27, 2014; Las Vegas, NV, USA; Conor McGregor (blue gloves) is victorious over Dustin Poirier during a featherweight fight during UFC 178 at MGM Grand Garden Arena. Mandatory Credit: Stephen R. Sylvanie-USA TODAY Sports
STOCKHOLM, SWEDEN - APRIL 06: (L-R) Conor McGregor punches Marcus Brimage in their featherweight fight at the Ericsson Globe Arena on April 6, 2013 in Stockholm, Sweden. (Photo by Josh Hedges/Zuffa LLC/Zuffa LLC via Getty Images)
BOSTON, MA - JANUARY 18: Conor McGregor of Ireland punches Dennis Siver of Germany in their featherweight fight during the UFC Fight Night event at the TD Garden on January 18, 2015 in Boston, Massachusetts. (Photo by Jeff Bottari/Zuffa LLC/Zuffa LLC via Getty Images)
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"IT'S OFFICIAL!!!" Mayweather wrote on his Twitter account alongside a short video that included still photos of both fighters.

"THE FIGHT IS ON," McGregor tweeted minutes before Mayweather's post.

The two fighters have gone back and forth for nearly a year regarding a potential showdown with both men previously stating they each wanted $100 million for the fight.

UFC president Dana White told ESPN that the fight will take place at the T-Mobile Arena and that McGregor will weigh in at 154 pounds.

26 PHOTOS
Floyd Mayweather Jr.
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Floyd Mayweather Jr.
Sep 11, 2015; Las Vegas, NV, USA; Floyd Mayweather weighs in for his upcoming boxing fight against Andre Berto (not pictured) at MGM Grand Garden Arena. Mandatory Credit: Joe Camporeale-USA TODAY Sports
Sep 11, 2015; Las Vegas, NV, USA; Floyd Mayweather (left) and Andre Berto face off during weigh-ins for their upcoming boxing fight at MGM Grand Garden Arena. Mandatory Credit: Joe Camporeale-USA TODAY Sports
Undefeated WBC/WBA welterweight champion Floyd Mayweather Jr. speaks during a news conference at MGM Grand Hotel & Casino in Las Vegas September 9, 2015. Mayweather will defend his titles against challenger Andre Berto at the MGM Grand Garden Arena on Sept. 12 in what he says will be his final fight. REUTERS/Las VegasSun/Steve Marcus
Britain Boxing - Gervonta Davis v Liam Walsh IBF Super-Featherweight Title - Copper Box Arena, London - 20/5/17 Gervonta Davis celebrates with Floyd Mayweather Jr after winning the fight Action Images via Reuters / Andrew Couldridge Livepic
Floyd Mayweather, Jr. of the U.S. celebrates after defeating Manny Pacquiao of the Philippines in their welterweight WBO, WBC and WBA (Super) title fight in Las Vegas, Nevada, May 2, 2015. REUTERS/Steve Marcus
Promoter and former champion boxer Floyd Mayweather (C) speaks during a press conference announcing WBA super lightweight champion Adrien Broner's fight against Ashley Theophane, in Washington, DC, February 29, 2016. The title contest is scheduled to take place April 1, 2016 at the D.C. Armory in Washington DC. / AFP / JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)
Aug 6, 2015; Los Angeles, CA, USA; Mayweather Promotions CEO Leonard Ellerbe looks on as Floyd Mayweather, Jr. and Andre Berto face off during a press conference to announce the upcoming fight on September 12, 2015 at J.W. Marriott LA Live. Mandatory Credit: Jayne Kamin-Oncea-USA TODAY Sports
LOS ANGELES, CA - JANUARY 23: Boxer Floyd Mayweather Jr. attends the Danny Garcia and Robert Guerrero WBC championship welterweight bout at Staples Center January 23, 2016 in Los Angeles, California. (Photo by Kevork Djansezian/Getty Images)
LOS ANGELES, CA - JULY 16: Professional boxer Floyd Mayweather Jr. arrives at the 2014 ESPY Awards at Nokia Theatre L.A. Live on July 16, 2014 in Los Angeles, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
World Boxing Council (WBC) welterweight champion Floyd Mayweather Jr. of the U.S. works on his abdominal muscles at the Mayweather Boxing Club in Las Vegas, Nevada April 22, 2014. Mayweather is preparing for his fight against World Boxing Association (WBA) champion Marcos Maidana of Argentina at the MGM Grand Garden Arena in Las Vegas on May 3. REUTERS/Steve Marcus (UNITED STATES - Tags: SPORT BOXING)
LOS ANGELES, CA - JULY 16: Boxer Floyd Mayweather Jr. attends The 2014 ESPYS at Nokia Theatre L.A. Live on July 16, 2014 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)
World Boxing Council (WBC) welterweight champion Floyd Mayweather Jr. (L) of the U.S. works on his timing with his uncle and trainer Roger Mayweather at the Mayweather Boxing Club in Las Vegas, Nevada April 22, 2014. Mayweather is preparing for his fight against World Boxing Association (WBA) champion Marcos Maidana of Argentina at the MGM Grand Garden Arena in Las Vegas on May 3. REUTERS/Steve Marcus (UNITED STATES - Tags: SPORT BOXING)
CHICAGO - JULY 15: Boxer Floyd 'Money' Mayweather, Jr. acknowledges his fans during the 'Mayhem: Mayweather vs. Maidana II' championship rematch press conference at the Auditorium Theatre on July 15, 2014 in Chicago, Illinois. (Photo By Raymond Boyd/Getty Images)
Manny Pacquiao of the Philippines (R) and Floyd Mayweather, Jr. of the U.S. fight in the seventh round during their welterweight WBO, WBC and WBA (Super) title fight in Las Vegas, Nevada, May 2, 2015. REUTERS/Steve Marcus
LOS ANGELES, CA - AUGUST 07: Floyd Mayweather, Jr. attends the screening of 'Freelancers' at Mann Chinese 6 on August 7, 2012 in Los Angeles, California. (Photo by Imeh Akpanudosen/Getty Images)
Mar 11, 2015; Los Angeles, CA, USA; Floyd Mayweather (left) and Manny Pacquiao during a press conference to announce their fight on May 2, 2015 at the Nokia Theater in Los Angeles. Mandatory Credit: Robert Hanashiro-USA TODAY Sports
Britain Boxing - Gervonta Davis & Liam Walsh Press Conference - The Landmark London - 18/5/17 Floyd Mayweather during the press conference Action Images via Reuters / Andrew Couldridge Livepic EDITORIAL USE ONLY.
Sep 12, 2014; Las Vegas, NV, USA; Floyd Mayweather (left) and Marcos Maidana face off during the the weigh-in for their WBC Superwelter weight title fight MGM Grand Garden Arena. Mandatory Credit: Jayne Kamin-Oncea-USA TODAY Sports
Britain Boxing - Frank Warren & Floyd Mayweather Jr Press Conference - Savoy Hotel, London - 7/3/17 Floyd Mayweather Jr during the press conference Action Images via Reuters / Andrew Couldridge Livepic
Sep 13, 2014; Las Vegas, NV, USA; Floyd Mayweather (green gloves) and Marcos Maidana (blue gloves) trade punches during their WBC & WBA Welterweight and WBC Superwelter Weight title fight at the MGM Grand Garden Arena. Mandatory Credit: Jayne Kamin-Oncea-USA TODAY Sports
Floyd Mayweather, Jr. of the U.S. celebrates defeating Manny Pacquiao of the Philippines in a unanimous decision following their welterweight WBO, WBC and WBA (Super) title fight in Las Vegas, Nevada, May 2, 2015. REUTERS/Steve Marcus
Floyd Mayweather, Jr. of the U.S. lands a left to the face of Manny Pacquiao of the Philippines (R) in the 11th round during their welterweight WBO, WBC and WBA (Super) title fight in Las Vegas, Nevada, May 2, 2015. REUTERS/Steve Marcus
Undefeated WBC/WBA welterweight champion Floyd Mayweather Jr. (L) of the U.S. and WBO welterweight champion Manny Pacquiao of the Philippines face off during an official weigh-in at the MGM Grand Garden Arena in Las Vegas, Nevada May 1, 2015. The boxers will fight in a welterweight unification bout at the arena on May 2. REUTERS/Steve Marcus
World Boxing Council (WBC) welterweight champion Floyd Mayweather Jr. of the U.S. is seen during a media workout at the Mayweather Boxing Club in Las Vegas, Nevada April 22, 2014. Mayweather is preparing for his fight against World Boxing Association (WBA) champion Marcos Maidana of Argentina at the MGM Grand Garden Arena in Las Vegas on May 3. REUTERS/Steve Marcus (UNITED STATES - Tags: SPORT BOXING)
WBC/WBA welterweight champion Floyd Mayweather Jr. (L) of the U.S. reaches for a punch on Marcos Maidana of Argentina during their title fight at the MGM Grand Garden Arena in Las Vegas, Nevada September 13, 2014. REUTERS/Steve Marcus (UNITED STATES - Tags: SPORT BOXING)
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Mayweather Promotions will publicize the event, which will be available on Showtime pay-per-view.

"I talked to Conor McGregor this morning," White said. "He is absolutely, 100 percent positive that he wins this fight."

If McGregor pulls that off, it would rank among the greatest boxing upsets of all time.

Mayweather is widely regarded as one of the best defensive fighters ever, and prides himself on his ability to evade punishment with his skillful movement about the ring while making adjustments against opponents on the fly.

McGregor, the UFC's reigning lightweight champion and former featherweight champion, is known as much for his bravado as for his explosive knockout power inside an MMA octagon.

The Irishman became the first UFC fighter to hold two belts simultaneously when he knocked out Eddie Alvarez in New York last November for the lightweight championship.

The UFC stripped McGregor of his featherweight belt shortly after that fight when he announced he would be taking some time off after he and long-time partner Dee Devlin had their first baby in May.

Known for his devastating striking and highlight-reel knockouts, McGregor is also quick and irrational on his feet, but few would back him to beat one of the most complete boxers of all time.

A win for Mayweather would move him ahead of former heavyweight great Rocky Marciano, who also retired with a perfect 49-0 career record.

(Additional reporting by Frank Pingue and Philip O'Connor, editing by Gene Cherry)

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