Tim McGraw and Daughtry are among the musical acts scheduled to perform at tennis legend Andre Agassi's 14th annual Grand Slam for Children concert set for Sept. 26 at Wynn Las Vegas, a hotel, casino and resort. Dane Cook and Brian McKnight will also perform at the charity concert featuring musical director David Foster. The event, which has raised almost $75 million since 1995, supports the Andre Agassi Foundation and the Andre Agassi College Preparatory Academy in Las Vegas.