(3) (3) Mikhail Prokhorov team owner of the Booklyn Nets is seen here with former minority stake owner in the NBA franchise , rapper and entrepreneur Jay-z . The entertainer has since sold his interest in the team back to Prokhorov , having become the founder and owner of sports` management company RocNation Sports , a full consultancy sports management firm sports marketing and promotions company , managing athletes and and their business portfolios . Jay`z was also licensed as a certified sports agent by the NBA, WNBA , NFL , NHL , MLB . Prokorov for his part in conjunction with team general manager Billy King in the past two seasons have spent in excess of $ 375 million on team payroll and luxury taxes for a franchise , that has yet to progress beyond the first round of the postseason since he assumed control of the Brooklyn Nets . Getty Images / Mark McNair ….