NEW YORK (AP) — Novak Djokovic used some of his spotlight as the world's top tennis player to let another light shine. [...] as Djokovic sat with a smile on his face, little Zia belted out a tune she wrote and dedicated to the people of Africa, called "African Sun." When she finished, Djokovic wrapped her in a bear hug and a group of reporters gathered around the young singer. Raonic's hair, already the subject of much discussion on tour, got a new spritz of publicity Saturday when CBS tennis analyst John McEnroe commented how even gale-force winds wouldn't muss Raonic's lid, asking, "Does any piece of his hair ever go out of place?" U.S.