Floyd Mayweather Jr. vs. Manny Pacquiao, billed as "The Fight of the Century", or the "Battle for Greatness", was a professional boxing match between undefeated five-division world champion Floyd Mayweather Jr. and eight-division world champion Manny Pacquiao.
 It took place on May 2, 2015, at the MGM Grand Garden Arena in Las Vegas, Nevada.
 Mayweather Jr. won the contest by unanimous decision, with two judges scoring it 116–112 and the other 118–110.
 Although the fight was considered to be one of the most anticipated sporting events in history, it was largely considered a letdown by critics and audiences alike upon its broadcast.
Floyd Mayweather Jr. vs. Marcos Maidana II, billed as "Mayhem", was a world championship boxing match held on September 13, 2014, in the MGM Grand Garden Arena in Las Vegas, United States.
Floyd Mayweather Jr. vs. Andre Berto, billed as "High Stakes", was a professional boxing fight, contested for the welterweight championship.
 The bout was held on September 12, 2015 at the MGM Grand Garden Arena in Las Vegas, Nevada on Showtime PPV Mayweather Jr. confirmed his retirement after the bout.
The MGM Grand Las Vegas (formerly Marina and MGM-Marina) is a hotel and casino located on the Las Vegas Strip in Paradise, Nevada.
 The MGM Grand is the largest single hotel in the United States with 5,124 rooms.
 It is also the third-largest hotel complex in the world by number of rooms and second-largest hotel resort complex in the United States behind the combined The Venetian and The Palazzo.
 When it opened in 1993, the MGM Grand was the largest hotel complex in the world.
Floyd Mayweather Jr. vs. Ricky Hatton, billed as Undefeated, was a boxing superfight that took place on December 8, 2007, at the MGM Grand Garden Arena in Las Vegas, between reigning WBC & "The Ring" welterweight champion Floyd Mayweather Jr. and reigning "The Ring" light welterweight champion Ricky Hatton.
Floyd Mayweather Jr. vs. Marcos Maidana, billed as "The Moment", was a boxing welterweight championship fight.
 The bout was held on May 3, 2014, in the MGM Grand Garden Arena, at the MGM Grand Hotel & Casino in Las Vegas, Nevada, United States, on Showtime PPV.
Floyd Mayweather Jr. vs. Conor McGregor, also known as "The Money Fight" and "The Biggest Fight in Combat Sports History", was a professional boxing match between undefeated eleven-time five-division boxing world champion Floyd Mayweather Jr. and two-division mixed martial arts (MMA) world champion and at-the-time current UFC Lightweight Champion Conor McGregor.
 The match took place at the T-Mobile Arena in Paradise, Nevada, on August 26, 2017 at the light-middleweight weight class (154 lbs; 69.9 kgs).
 It was scheduled for twelve rounds.
Floyd Mayweather Jr. vs. Robert Guerrero, billed as May Day, was a boxing welterweight championship superfight for Mayweather's World Boxing Council (WBC) Welterweight title and vacant "Ring" Welterweight title.
 The bout was held on May 4, 2013, in the MGM Grand Garden Arena at the MGM Grand Hotel & Casino in Las Vegas, Nevada, United States on Showtime PPV.
 The bout was the first major televised fight of Mayweather's career to not be aired on HBO PPV.
 The card featured some of the rising stars of Mayweather Promotions: J'Leon Love, Badou Jack, Luis Arias, Ronald Gavril and Lanell Bellows.
 Mayweather won via unanimous decision with Guerrero winning the first 3 rounds, then Mayweather adjusted and won from the 4th to 12th round.
Kenny Bayless (born 1950) is an American boxing referee from Nevada.
 He is best known for having refereed many of the sport's superfights, including Manny Pacquiao vs. Ricky Hatton, Oscar De La Hoya vs. Floyd Mayweather Jr., Ricky Hatton vs. Paulie Malignaggi, Miguel Cotto vs. Antonio Margarito, Manny Pacquiao vs. Miguel Cotto, as well as Floyd Mayweather Jr. vs. Manny Pacquiao.
 Bayless's catchphrase, when giving his instructions to the fighters before the opening bell, is "What I say you must obey."
Floyd Mayweather vs. Juan Manuel Márquez, billed as Number One/Número Uno, was a welterweight superfight which took place on September 19, 2009, at the MGM Grand Arena in Las Vegas between five-division world champion Floyd Mayweather Jr. (39–0, 25 KO) and three-division champion Juan Manuel Márquez (50–4–1, 37 KO).
 The fight served as a return to the ring for Mayweather, who, after his knock out victory of Ricky Hatton in December 2007, announced he would take a two-year layoff from boxing which later turned into retirement.

Question: How many rooms does the hotel where the fight between Floyd Mayweather Jr. and Marcos Maidana was held have?
Answer: 5,124