The USA won ahead of Great Britain and Japan with America’s anchor Michael Phelps collecting his 21st Olympic gold medal in the process.

The 31-year-old earlier claimed the 200m butterfly making him the oldest person to win a gold medal in an individual event.

Phelps still has the 200m individual medley, the 100m butterfly and the medley relay remaining on his Olympic schedule, meaning he could finish the Olympics with 24 golds.

Ridiculous effort from a remarkable champion.

Phelps has claimed 24 medals across four Olympics.