Floyd Mayweather and Conor McGregor are forever linked after the two met in the boxing ring in 2017. It was a huge financial success for both men, especially McGregor in his boxing debut making over $30 million in his disclosed purse. But three years later with the Irishman announcing his "retirement" for a third time, Mayweather isn't ready to let him forget what happened and what could happen again if they meet again.

McGregor tweeted out that he was retiring from fighting moments after the UFC 250 pay-per-view went off the air. With the UFC struggling to get its stars back in action for big fights, the move may have been a ploy to improve McGregor's standing in upcoming negotiations for a return to the Octagon. Enter Mayweather.

"If I'm not mistaken, didn't you tell Mike Tyson you could beat me if we fought a second time?" Mayweather wrote in response to a McGregor post on Instagram. "Now you're quitting! I thought you wanted to beat the best? Well, if you decide to come back, I will be waiting to punish you again."

McGregor made his return to the UFC in January, knocking out Donald Cerrone in 40 seconds. According to UFC president Dana White, the win made McGregor the No. 1 contender at lightweight, despite the fight taking place at welterweight. The Cerrone fight was also McGregor's return from a retirement announced in March 2019.

Mayweather stopped McGregor in round 10 of their 2017 clash. The win ran his career record to 50-0. While Mayweather has stressed that he is "retired from the sport of boxing," in the same interview with Fight Hype this May, he said he likes to face men who "got countries behind them."

"Even with the Conor McGregor -- that was smart on my behalf," Mayweather said in that same interview. "It was also smart on his behalf. He said, "You know what? Even if I can or can't beat Floyd Mayweather, let me try and share the ring with him, so I can make more money than any MMA fighter or any other fighter except Floyd. So, even if we did it again, it's entertainment and it's business."