Mayweather, who squares off against Manny Pacquiao on Sunday, said he had no doubt he was the greatest fighter of all-time — not Ali or Sugar Ray Robinson.

“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,” Mayweather told ESPN presenter Stephen A. Smith.

Well, it appears Ali got the message.

He might be 73 and so ill from Parkinson’s disease he can barely speak, but the champ — or whoever controls his Twitter account — showed he still has that trademark humour and swagger by posting this on Tuesday.