Floyd Mayweather has been sued by CSI Sports Events for breach of contract related to his upcoming fights with Mike Tyson and Manny Pacquiao. The lawsuit was filed on June 19, 2026, in federal court in New York. It claims Mayweather broke key terms by agreeing to fight Mike Zambidis instead of sticking to his exclusive agreement with CSI Sports Events. The company is seeking a court order to stop Mayweather’s fight against Zambidis, which was scheduled for June 27, 2026, in Greece.
The dispute involves agreements made in 2025 and early 2026 between Mayweather and CSI Sports Events. On August 10, 2025, Mayweather agreed to a fight with Mike Tyson. This was reinforced by an exclusive contract signed in November 2025, covering Mayweather’s later fights, including the match with Manny Pacquiao. CSI Sports Events advanced $4.5 million to Mayweather, covering preparations such as $150,000 for medical tests related to the Tyson fight done in February 2026. These advances came with the expectation that Mayweather would meet his obligations for the Tyson and Pacquiao fights, which had large financial stakes.
CSI Sports Events says Mayweather’s choice to accept a fight with Mike Zambidis violated these agreements, jeopardizing the company’s investment and expected profits. The lawsuit asks for a court order to stop the Zambidis fight and stresses the exclusivity of Mayweather’s contract commitments. The legal action also states Mayweather was set to earn about $14 million for the Tyson fight, showing the financial weight of any contract breach.
Mayweather faces other legal and financial problems. ESPN reports he has multiple legal issues separate from this lawsuit, including felony charges for bad checks in Nevada. These problems have raised concerns about his financial management, with some insiders pointing to his expensive spending and risky business choices.
Because of this lawsuit, Mayweather’s scheduled fight with Zambidis is uncertain. If the court grants the injunction sought by CSI Sports Events, the fight set for June 27 in Greece will not happen. This raises questions about Mayweather’s upcoming fights with Tyson and Pacquiao, which many in the boxing world were looking forward to.
CSI’s lawsuit and the request for an injunction focus attention on the contracts between athletes and promoters in high-money sports. The case shows the legal problems that can happen when exclusive agreements are broken, especially in professional boxing where schedules and fighter commitments are carefully planned and heavily financed.
Mayweather, known for his undefeated professional record, now faces these legal challenges. The results of this lawsuit and his other legal problems could affect his ability to arrange future fights, gain financial support, and keep his place in boxing.
The lawsuit filed by CSI Sports Events in June 2026 marks an important moment in Mayweather’s career. With large amounts of money involved and exclusive rights questioned, how this dispute ends will likely affect how high-profile boxing matches are handled in the future. The case will be watched closely by people in the boxing business, fans, and legal experts interested in sports contract law.
