The USTA has announced that chart-topping pop superstars Jonas Brothers and Demi Lovato will hold court with tennis world number one-ranked Rafael Nadal, Andy Roddick, Kim Clijsters and Novak Djokovic at the 15th Annual Arthur Ashe Kids’ Day presented by Hess, Saturday, Aug. 28 at the USTA Billie Jean King National Tennis Center in Flushing, N.Y., from 9:30 a.m.-4:00 p.m.