As two of combat sports' highest-earning athletes collide, each man is expected to earn more than £100m on the given night, a sum which will take their career earnings into the stratosphere.
The pair's final news conference at the MGM Grand in Las Vegas proved far calmer than any media event in the build-up to what could be the most lucrative fight in boxing history. "We're both real fighters". When the two finally do clash in the middle of the ring on Saturday night, many fans of both sports believe it will be a match of MMA vs. boxing, with each representing the overarching reputation of their respective sport.
Saturday night is almost here when these two will finally end all of this, and on Wednesday, we found out that they'll at least be fighting for more than just pride and bragging rights in Las Vegas.
McGregor faces his first ever professional boxing contest against Mayweather, the undefeated former welterweight king who has come out of a two-year retirement to take on the Irish mixed martial arts star.
Other than boxing, Mayweather heads a business venture called The Money Team that invests in a range of areas including sport, fashion, music and entertainment. I don't want to do this, I want to go home.
"It was a little bit of everything that made me come back for this fight", he added. "I don't see him lasting two rounds". The fighters, it appears, are all talked out after the brief but very intense buildup to a fight that was finalized in mid-June. To be in the sport 21 years, I had to take it extremely seriously.
McGregor isn't impressed. He shrugged when asked the inevitable question about whether Mayweather's extracurricular trips indicated overconfidence in a win.
"I saw him, and I said, 'What are you afraid of a faceoff today?'" McGregor said.
"He has made a big error with the 8oz gloves, I now have the decision to end it inside one". "I'm going to win". We are prepared, I will put pressure on him and break this old man. Malignaggi repeatedly yelled at McGregor to "bring his balls" to the fight this Saturday, while the UFC champ responded, "Get over it". Fighters, at any level, get easily gassed when overextending and missing punches.