Legendary Undefeated Boxer Floyd Mayweather Jr., has announced an exhibition fight against a kickboxer, before he rematches Manny Pacquiao.

Mayweather, 49, will fight Pacquiao, 47, for the second time on Sept. 19 in Las Vegas when he comes out of retirement.

But beforehand, he will step into the ring under exhibition rules to face Mike Zambidis in June 2026 in Athens, Greece.

"2026 is already shaping up to be an exciting year for me," he posted to social media. "Europe, I'm on the way to entertain! Athens, Greece... get ready for an all-out exhibition. This summer will be a legendary battle."

"June is the month where history will be made at the Telekom Center. Different energy. Different level."

Zambidis, 45, is a retired kickboxer from Greece whose professional career ended 11 years ago.

His social media lists "18 world titles, 87 savage knockouts" among his accomplishments.

Zambidis is nicknamed "Iron Mike," famously like Mike Tyson who is also supposedly entering the ring against Mayweather this year.

Interestingly, this nickname is shared with Mike Tyson, who is also rumored to be fighting Mayweather in an exhibition this year, though that contest remains formally unannounced.

Since he has retired from professional boxing after defeating Conor McGregor in 2017 to achieve a perfect 50-0 record, he participated in numerous exhibition bouts.

His past exhibition opponents such as Logan Paul, Tenshin Nasukawa, Don Moore, Mikuru Asakura, Aaron Chalmers, and John Gotti III.

The upcoming clash against Manny Pacquiao will mark a significant deviation from his recent exhibition circuit, as it is slated to be a professional fight.

This means that Mayweather's esteemed undefeated 50-0 record will once again be on the line, adding immense stakes to the September rematch against his long-time rival.