Conor McGregor wore a "F*ck You" suit and went off at the press conference

Floyd Mayweather Jr. and Conor McGregor have thrown their first verbal jabs.

Conor McGregor made a bold prediction for the fight' "'m gonna knock him out inside of four rounds".

The Irish UFC champion and undefeated boxer kicked off the four-city promotional tour for their Aug. 26 bout Tuesday, facing off in front of 11,000 fans in downtown Los Angeles.

McGregor and Mayweather traded clever insults and profane boasts with their familiar flair as they begin to sell a boxing match that could be much more entertaining before the opening bell.

McGregor's suit also pulled no punches...

Parts of his article was first published on nzherald.co.nz and is republished here with permission.