Michael Phelps won his 22nd Olympic gold medal and fourth consecutive 200 metres individual medley title in Rio on Thursday.
The 31-year-old American won gold in one minute 54.66 seconds to take his second individual title and fourth gold of the 2016 Games.
Kosuke Hagino of Japan, the 400m individual medley champion, was second in 1min 56.61secs and Wang Shun of China third in 1:57.05.
Ryan Lochte, Phelps' team-mate, could only finish fifth in 1:57.47, while Britain's Dan Wallace was eighth in 1:58.54.
Andrew Bree reacts to the awesome Michael Phelps #rterio2016 https://t.co/mZAc0taZTy
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Phelps has an opportunity for another gold on Friday night in one of his favourite events.
He won the 100m butterfly title at the 2004, 2008 and 2012 Games and will go for a fourth straight win after qualifying fifth fastest.
He had to dash from the medal presentation to the call room and placed second in the first semi-final, clocking 51.58.
Joseph Schooling of Singapore was the fastest qualifier in 50.83, while South Africa's Chad le Clos advanced in 51.43.
Ryan Murphy (above) completed a backstroke double and extended a US winning streak, adding the Olympic men's 200m gold to the 100m title he won earlier in the week.
The US men have now won the event for six successive Olympics dating back to Atlanta in 1996.
World champion Mitch Larkin, who had hoped to become only the second Australian to win a backstroke gold and the first since 1960, took the silver medal while Russian Evgeny Rylov clinched bronze.
"There's a lot of pressure. Unfortunately Ryan came over the top of me," said Larkin.
Murphy, a 21-year-old first time Olympian, trailed Larkin over the first 50 metres but took the lead after the turn and stayed ahead to touch out in one minute, 53.62 seconds -- the fastest time of the year.
He will be heavily fancied to take his third medal of the Games in Saturday's medley relay, having set an Olympic record in winning the 100 backstroke.
"That one was very painful but I wanted it bad. The 100m backstroke comes more naturally for me," said Murphy.
"The 200 back is an event I really have to dig deep for. This medal means a little more to me."
Larkin finished in 1:53.96, beating world junior champion Rylov (1:53.97) by the closest of margins.
Tyler Clary, the gold medallist at London 2012, was unable to defend his title after failing to be selected at the US trials.
