Irish boxing champ Katie Taylor pulled no punches when she took on Belfast Olympic bronze medal winner Paddy Barnes... on Twitter.
Barnes was up for a bit of knockabout, as he compared Taylor's five world titles to his two Commonwealth golds.
"Here Katie Taylor - ya may have 5 World titles but have ya got 2 Commonwealth Games titles? Fight me," wrote Barnes.
But he didn't bet on Taylor's wit being as deadly as her right hook, as she floored him with a withering comeback.
"Haha! The Commonwealths?! Sure my Ma would win a gold medal in that!" she retorted.
That might have been the final round, until a tweet from RTE Sport goaded Barnes back into action. "Score this round to Katie Taylor?"
Barnes picked himself up to fire one back: "Katie Taylor would love the public to see how really good she is, pity you don't show amateur boxing - I'll score this one to myself."