Jay-Z is putting Jerry McGuire to shame — because his budding sports agency just signed three-time NBA all-star Kevin Durant.

The OKC Thunder superstar just posted an Instagram of he and Jay signing docs that make him Roc Nation Sport’s newest client.Durant is the latest in a growing list of HUGE athletes jumping ship to Jay’s new venture … like NY Yankee Robinson Cano, NASCAR superstar Dale Earnhardt Jr., and NY Jet Geno Smith. Durant is Jigga’s first NBA star.FYI — Durant is currently in the middle of a massive 5-year, $89 million contract with the Thunder. His move to Roc Nation has more to do with landing big money deals off the court.