Floyd Mayweather's legal troubles continue to pile up, with a new lawsuit alleging the boxing icon breached a multi-million-dollar promotional agreement tied to his planned fights with Mike Tyson and Manny Pacquiao. According to a complaint obtained by The Ring , CSI Sports Events filed suit Thursday in New York, claiming it paid Floyd Mayweather millions in advances in exchange for exclusive rights to promote two major events: an exhibition against Tyson and a professional rematch with Pacquiao. The company is seeking an injunction to halt Mayweather's June 27 exhibition against Greek kickboxer Mike Zambidis in Athens and wants to recover $4.65 million it says it advanced to the undefeated former champion. The lawsuit claims CSI initially paid Mayweather $4.5 million and later sent another $150,000 to cover pre-fight medical expenses related to the Tyson exhibition .…