American Caeleb Dressel set an Olympic record on his way to winning the men's 100m freestyle gold medal as he seeks to become one of the most successful swimmers at an individual Games.

Dressel won in a time of 47.02 seconds to claim his second gold in Tokyo.

China took gold in a thrilling women's 4x200m freestyle in a world-record time of seven minutes 40.33 seconds.

Meanwhile Great Britain's Commonwealth champion James Wilby missed out on a medal in the men's 200m breaststroke.

He was second fastest in the semi-final and started well in the final before fading.

Australia's Zac Stubblety-Cook broke an Olympic record to win the race with a time of 2:06.38, finishing ahead of Arno Kamminga of the Netherlands and Finland's Matti Mattsson.