Phelps continues greatness as U.S. wins 4×100 freestyle relay August 8, 2016 Watch @MichaelPhelps win his first #Gold in Rio: https://t.co/q8KW6GUR30 https://t.co/8KyZ3TPA3u — NBC Sports (@NBCSports) August 8, 2016 After an unbelievable act of athleticism by…