Roc Nation launched Roc Nation Sports Presents: Throne Boxing at Madison Square Garden in New York City on Friday night. Of course Roc Nation kingpin Jay Z was on hand as well as a few other Roc Nation signees including Rihanna, New York Yankees C.C. Sabathia and Fabolous as I pointed out earlier. Also on hand was actor Jake Gyllenhaal, actor Michael K. Williams, actress Rosie Perez and it was hosted by Roc Nation’s own, Angie Martinez.