No means no. No amount of cajoling, arm-twisting and pleading by his team mates and swimming fans around the world will make Michael Phelps change his mind about retiring after the Rio Olympics.

Joseph Schooling beat Michael Phelps and made Singaporean sporting history on Friday when he won the 100 meters butterfly and his country's first Olympic gold medal.

Singapore's Joseph Schooling made life harder for Michael Phelps after beating the master in their 100 meters butterfly heats on Thursday and going through to the semi-finals with the fastest time.