Mayweather vs Pacquiao: Muhamamd Ali responds to Floyd Mayweather

Floyd Mayweather is a confident fighter. He always has been. That confidence is a big reason why he's the star that he is today, why he's become the pound-for-pound best fighter in the world, why he is fighting in what is going to be the biggest money fight ever on Saturday, Mayweather-Pacquiao.

But a recent comment in an interview with ESPN picked up some traction that sparked a response from "The Greatest." Mayweather told Stephen A. Smith, "No one can ever brainwash me to make me believe that Sugar Ray Robinson and Muhammad Ali was better than me. No one could ever brainwash me and tell me that."

Ali's official Twitter account replied on Monday:

"Don't you forget, I am the greatest!" #MuhammadAli pic.twitter.com/HXaTz39RPM

— Muhammad Ali (@MuhammadAli) April 27, 2015

The tweet could also be seen as directed toward George Foreman, Ali's one-time rival, who recently said that Mayweather was better than Ali:

"This is a better generation by far," Foreman told TMZ. "They're smarter, they're stronger, they're overall just better fighters. We were good and we liked the attention that we got. But boxing is on a different level. This is an amazing generation."

Old people pulled out their hair about this, or what was left of it, anyway! Grandpa! And grandma! Not like me, I'm young, and hip.