Like many boxing fans, the GUNS N' ROSES frontman was far from impressed with Saturday's big fight, which Americans paid $100 (£67) to watch as a pay-per-view TV event, and he's urging the organisers to stage a rematch.
In a series of tweets, Rose writes, "May/Pac The Free-Match. No Injuries No Holding No PPV (pay-per-view)... The Customer's Always Right May Pac II *The Free Fight...
"IT'S WHAT'S RIGHT... Boxing Greats Don't Duck The Fans May Pac II Free By Demand."
Mayweather won Saturday night's welterweight fight after largely keeping his distance from his opponent for 12 rounds. Pacquiao has since revealed he was nursing an injury prior to the fight after tearing his rotator cuff.