Conor McGregor was linked to a potential cross-sport summer showdown with retired boxing legend Floyd Mayweather last week, but UFC president Dana White quickly shot down the tabloid report. McGregor's coach John Kavanagh, meanwhile, fueled speculation with a joke on Twitter.

McGregor has previously said he'd be open to fighting the undefeated 39-year-old boxer, and it's easy to see why. A Mayweather-McGregor bout would destroy every single pay per view record, and two men who are very focused on making money would walk away with gigantic checks.

McGregor took things a step further Sunday, posting a Mayweather-McGregor fight poster on his Twitter page.

Mayweather, who walked away from the sport of boxing after his 49th victory, recently filed for trademarks on the terms TMT 50" and "TBE 50."