The stars will descend upon America when Spanish power Real Madrid come stateside to participate in this summer’s World Football Challenge. On Thursday, the 2010-11 La Liga runners-up and Champions League semifinalists unveiled a loaded roster highlighted by La Liga top scorer Cristiano Ronaldo, Spanish national-teamers Iker Casillas, Xabi Alonso and Sergio Ramos, defensive stalwarts Ricardo Carvalho and Pepe, as well as former Golden Ball and World Player of the Year winner Kaká.