TL;DR: Court documents have revealed the existence of a secret contract between Floyd Mayweather and Mike Zambidis for an exhibition bout in Greece, which was abruptly called off following a lawsuit filed by Celebrity Sports International (CSI). The legal dispute derailed the event just two days before it was scheduled to take place, raising new questions about Mayweather’s ongoing business dealings and the legality of his exhibition fight arrangements.

Leaked Court Docs Reveal Secret Mayweather-Zambidis Contract Behind Canceled Greece Exhibition

Court documents obtained by ESPN and other outlets have exposed the details of a previously undisclosed contract between boxing legend Floyd Mayweather and Greek kickboxing icon Mike Zambidis. The agreement, which called for an exhibition bout in Greece, was ultimately terminated after a lawsuit from Celebrity Sports International (CSI) intervened. The cancellation left fans and fighters scrambling just 48 hours before the event was set to take place.

Quick Answer

The leaked court documents reveal that Floyd Mayweather and Mike Zambidis had signed a private contract for an exhibition fight in Greece, organized without full public disclosure of the financial and promotional terms. A lawsuit filed by CSI against Mayweather alleged contractual violations, prompting a court to halt the event. The fight was officially canceled on June 23, 2026, just two days before its scheduled date.

Key Takeaways

• Court documents confirm a secret contract existed between Floyd Mayweather and Mike Zambidis for a Greece-based exhibition bout.
• CSI (Celebrity Sports International) filed a lawsuit against Mayweather, which led to the court-ordered cancellation of the event.
• The fight was canceled just two days before the scheduled date, leaving organizers, fighters, and fans without resolution.
• Mayweather’s exhibition model continues to face legal and financial scrutiny as multiple entities challenge his business practices.
• Mike Zambidis, a celebrated combat sports figure in Greece, was reportedly prepared to fight and expressed disappointment over the cancellation.

What Did the Leaked Court Documents Reveal?

The court filings, first reported by ESPN, unveiled a contract between Mayweather and Zambidis that had not been publicly announced in full detail. According to the documents, the agreement outlined the financial terms of the exhibition, the fighters’ obligations, and the promotional structure for the Greece event. Court records indicate that Mayweather was set to receive a guaranteed purse, while Zambidis would compete in front of his home crowd in an event marketed as a major international attraction.

The lawsuit from CSI alleged that Mayweather had entered into conflicting promotional agreements, potentially undermining CSI’s contractual rights related to the event. Ring Magazine’s reporting confirmed that the CSI lawsuit specifically cited Mayweather’s failure to honor exclusive promotional arrangements, which prompted the court to issue a restraining order blocking the fight.

How Did the CSI Lawsuit Lead to the Fight’s Cancellation?

Celebrity Sports International (CSI) filed suit against Mayweather in the days leading up to the event, claiming breach of contract. According to court documents reviewed by Sporting News, CSI asserted that it held exclusive promotional rights to Mayweather’s exhibition appearances and that the Greece bout violated those terms. The company sought an immediate injunction to prevent the fight from proceeding.

A court granted the injunction on June 23, 2026, effectively pulling the plug on the event with only two days remaining before the scheduled bell. The Tennessean reported that Mayweather’s legal team attempted to contest the order but was unsuccessful in overturning the court’s decision within the narrow time frame available.

Timeline of Events

Date	Event
Early 2026	Mayweather and Zambidis sign private exhibition contract for Greece
May 2026	Event announced publicly; tickets and promotional materials released
June 20, 2026	CSI files lawsuit against Mayweather alleging breach of exclusive promotional contract
June 23, 2026	Court issues injunction; fight officially canceled two days before scheduled date
June 24–25, 2026	Court documents leaked to media outlets including ESPN, Ring Magazine, and theScore

Who Is Mike Zambidis and Why Did This Fight Matter?

Mike Zambidis is one of the most decorated kickboxers in combat sports history, known throughout Greece and the global fighting community for his aggressive style and highlight-reel knockouts. Nicknamed “The Greek Dynamite,” Zambidis competed at the highest levels of K-1 and kickboxing for over two decades. An exhibition against Mayweather — even in a non-competitive format — represented a massive opportunity for Zambidis to showcase his skills on a global stage in front of his home fans.

According to Ring Magazine, Zambidis had been training specifically for the Mayweather exhibition and was reported to be devastated by the sudden cancellation. The fight would have been the biggest combat sports event in Greece in recent years, with significant economic implications for the local promotional team and venue.

What Does This Mean for Mayweather’s Exhibition Career?

This is not the first time Floyd Mayweather’s post-retirement exhibition tour has encountered legal complications. Since stepping away from professional boxing with a 50-0 record in 2017, Mayweather has headlined numerous exhibitions against opponents ranging from YouTube star Logan Paul to various martial arts figures. Each event has generated significant revenue, but the business side has frequently been marred by disputes.

The CSI lawsuit and subsequent court-ordered cancellation of the Zambidis bout add to a growing pattern of legal friction surrounding Mayweather’s exhibition deals. Industry analysts have noted that the lack of a centralized governing body for exhibition bouts creates a gray area in which multiple promoters and organizers may claim overlapping rights to the same fighter.

Mayweather’s Recent Exhibition History

• 2021: Floyd Mayweather vs. Logan Paul — an exhibition that drew massive pay-per-view numbers but faced criticism over its competitive legitimacy.
• 2022–2023: Multiple exhibitions in Dubai and other international locations, some of which faced promotional disputes and delayed payments.
• 2024–2025: Continued exhibition tour with fights in various countries, including events organized under Mayweather’s own promotional banner, TMT (The Money Team).
• 2026: Greece exhibition against Zambidis canceled due to CSI lawsuit, marking one of the highest-profile disruptions to Mayweather’s exhibition schedule.

Why Does the Mayweather-Zambidis Contract Stay Secret?

Exhibition bouts in boxing operate outside the regulatory framework that governs official professional fights. Unlike sanctioned bouts overseen by athletic commissions, exhibitions often rely on private contracts between fighters, promoters, and venue operators. These agreements frequently include non-disclosure clauses that keep financial terms and promotional rights out of public view.

According to legal experts quoted in the Sporting News coverage, the secretive nature of these contracts is what allowed the Mayweather-Zambidis deal to exist without public knowledge until the CSI lawsuit forced the terms into the court record. This lack of transparency has been a recurring criticism of the exhibition model, as fighters, sponsors, and fans are often left in the dark about the business arrangements underlying these events.

What Are the Legal Implications for Future Mayweather Exhibitions?

The court’s decision to halt the Greece exhibition sets a significant precedent for how future Mayweather bouts — and potentially other high-profile exhibitions — may be structured. Legal analysts suggest that Mayweather and his team will need to tighten their contractual processes to avoid overlapping agreements that could trigger similar lawsuits.

For fans and promoters, the leaked court documents underscore the importance of verifying promotional rights before committing to large-scale events. The financial losses associated with the last-minute cancellation in Greece — including venue costs, travel arrangements, and marketing expenditures — could amount to millions of dollars borne by multiple parties.

How Has the Combat Sports Community Reacted?

The reaction from the combat sports world has been swift and largely critical of the situation. Prominent boxing journalists, including those at ESPN and Ring Magazine, have called for greater regulation of exhibition bouts to protect fighters and organizers from exactly this type of disruption. The Greek sports community, in particular, has expressed frustration over what they see as a disregard for the local market and its fans.

Mike Zambidis himself has remained relatively quiet since the cancellation, though sources close to the fighter indicate he is exploring legal options to recover losses incurred during his training camp and preparation for the event. Mayweather has not issued a public statement addressing the leaked contract or the CSI lawsuit as of June 25, 2026.

Conclusion

The leaked court documents revealing the secret Mayweather-Zambidis contract have pulled back the curtain on the complex and often opaque world of boxing exhibitions. Floyd Mayweather’s canceled Greece bout against Mike Zambidis — halted by a CSI lawsuit just two days before the event — raises serious questions about the business practices, legal safeguards, and regulatory oversight governing exhibition fights. As Mayweather continues to pursue lucrative exhibition opportunities worldwide, the fallout from this legal dispute will likely shape how future events are negotiated, disclosed, and executed.

For more information on boxing business and legal developments, see our coverage of Mayweather’s exhibition fight history and combat sports contract law.

The Bottom Line

The Mayweather-Zambidis exhibition fight was officially canceled after court documents exposed a secret contract and a competing promotional claim from Celebrity Sports International. This development marks a significant moment in the ongoing debate over transparency and regulation in professional boxing exhibitions, and it leaves Mayweather’s future exhibition plans facing increased legal and public scrutiny.

Frequently Asked Questions

Why was the Mayweather vs. Zambidis fight canceled?

The fight was canceled after Celebrity Sports International (CSI) filed a lawsuit against Floyd Mayweather, alleging breach of an exclusive promotional contract. A court granted an injunction on June 23, 2026, just two days before the scheduled event, preventing the fight from taking place.

What did the leaked court documents reveal about the Mayweather-Zambidis contract?

The court documents revealed that Mayweather and Zambidis had signed a private agreement for an exhibition bout in Greece, including financial terms and promotional obligations that had not been publicly disclosed. The existence of conflicting promotional claims led to the legal dispute with CSI.

Who is Mike Zambidis?

Mike Zambidis is a legendary Greek kickboxer known as “The Greek Dynamite.” He competed at the highest levels of K-1 and kickboxing for over two decades and is widely regarded as one of the greatest combat sports athletes in Greek history. The Mayweather exhibition would have been his highest-profile bout in years.

Has Mayweather faced legal issues with exhibition fights before?

Yes. Floyd Mayweather’s post-retirement exhibition tour has been marked by several promotional disputes and legal challenges. The lack of centralized regulation for exhibition bouts has created recurring issues with overlapping contractual claims and financial disagreements between promoters.

Will the Mayweather vs. Zambidis fight be rescheduled?

As of June 25, 2026, there has been no official announcement about rescheduling the fight. The outcome of the CSI lawsuit and the legal implications of the court’s injunction will likely determine whether a future bout can be organized under new terms.

Are boxing exhibitions regulated by athletic commissions?

Most boxing exhibitions operate outside the regulatory framework of athletic commissions, relying instead on private contracts between fighters and promoters. This lack of oversight is a key factor in the disputes that have plagued Mayweather’s exhibition career, including the Zambidis cancellation.