RIO DE JANEIRO, - Joseph Schooling sensationally upset Michael Phelps in the 100m butterfly on Friday to seize Singapore's first ever Olympic gold medal at the Rio Games. The 21-year-old Asian champion denied Phelps a fourth straight victory in the event, leading from start to finish to win in an Olympic record of 50.39sec. Phelps, sixth at the turn, couldn't do enough coming home, but he…