McGregor & Mayweather started to jab

"He is f---ed," McGregor said. "There's no other way about it. His little legs, his little core, his little head -- I'm gonna knock him out inside four rounds, mark my words."

"He look good for a seven-figure fighter, he look good for a seven-figure fighter," Mayweather said. "I look good for a nine-figure fighter."

You can learn more and see the video here:
http://www.espn.com/boxing/story/_/id/19966520/floyd-mayweather-conor-mcgregor-trade-insults-promo-tour-begins-los-angeles