RIO 2016: Phelps wins more golds, bronze for Aussie
SWIMMING: Michael Phelps has won his 20th and 21st gold medals.
The American superstar first got revenge on South African Chad Le Clos in the 200m butterfly before anchoring the US team to glory in the 4x200m freestyle relay.
The golds took Phelps up to 25 Olympic medals overall.
The American, 31, just sneaked victory in the 200m butterfly in one minute 53.36 seconds only just ahead of fast-finishing Masato Sakai from Japan, who won silver and Hungary's Tamas Kenderesi in bronze.
Phelps avenged 29-year-old Chad Le Clos' victory over him at London 2012 as the South African only managed to finish fourth.
The 200m butterfly was the event which Phelps had targeted following his dramatic defeat in London four years ago.
He collected his gold and returned soon after as the Americans stormed home in the relay with Great Britain in silver and Japan in bronze.
The Aussie team of Tom Fraser-Holmes, David McKeon, Daniel Smith and Mack Horton finished fourth.
Earlier, Australian swimmer Emma McKeon won the bronze medal in the women's 200m freestyle.
McKeon's bronze follows her gold medal as part of Australia's victorious 4x100m relay team last Saturday night.
American Katie Ledecky won her second gold medal with Swede Sarah Sjostrom taking silver.
Australian Bronte Barratt finished equal fifth.
McKeon's medal came not long after fellow Aussie Kyle Chalmers was the fastest qualifier for Thursday morning's 100m freestyle final.
The 18-year-old South Australian went quicker than race favourite Cameron McEvoy, who was equal-third fastest.
Chalmers' time of 47.88 seconds helped him win his semi-final with defending Olympic champion, American Nathan Adrian (47.83s), touching out McEvoy in the other semi.
It was the second time in a day that Chalmers had gone under 48 seconds but he was trying to keep a check on his medal chances.
"I am probably trying to wind down, block it out of my mind completely, otherwise I will be up all night," he said.
Alicia Coutts, swimming her final individual event at the Olympics finished outside the medals in the 200m individual medley.
Aussie Coutts finished fifth in 2.10.88 behind Hungarian Katinka Hosszu, who took her third gold medal of the Rio Games ahead of Britain's Siobhan-Marie O'Connor in an Olympic record 2.06.58.
Madeline Groves was the fastest qualifier in the women's 200m butterfly semi-finals with fellow Aussie Brianna Throssell also making the final.