Istanbul - Ryan Lochte was once again the star of the show at the world short course championships on Friday when he won the 200m individual medley and broke his own world record in doing so.
The 28-year-old New Yorker, an 11-time Olympic medallist, finished in 1 minute, 49.63 seconds en route to a fourth consecutive gold medal at Sinan Erdem Arena.
Japan's Daiya Seto clocked 1:52.80 to add the silver medal to the gold he won in the 400m individual medley, and Laszlo Cseh of Hungary won bronze in 1:52.89.
It had already been a stellar meeting for Lochte after he had won gold in the 200m freestyle, 4x100m and 4x200m freestyle relays, but this was his best yet.
He wasted no time in taking the lead and by the end of the butterfly stage he was already under world record time. He held his pace over the backstroke, then stretched his lead further in the breaststroke.
By the time he turned for the freestyle leg he was well clear of his rivals and powered his way to the wall for his fourth gold medal of these championships and his 18th in world short-course championship history.
Paul Biedermann defended his men's 400m freestyle title, but he needed to be at his best after China's Hao Yun had gone out strongly from lane eight.
Eventually, the German caught Hao in the final 50m and touched home in 3:39.15, while Hao took silver with 3:39.48. Bronze went to Denmark's Mads Glaesner, who finished in 3:40.09.
Vladimir Morozov held off the challenge of two Olympic champions to win gold in the 50m freestyle and secure Russia's first gold of the championships.
The Russian swam in lane five between 2012 Olympic champion Florent Manaudou and 2000 champion Anthony Ervin, but he shrugged off their pressure to win in 20.55 seconds, while Manaudou won the silver in 20.88 and Ervin bronze in 20.99.
Daniel Gyurta came close to breaking his own 200m breaststroke world record, but in the end he had to be content with a new championship record of 2:01.35 as he won gold.
Great Britain's Michael Jamieson clocked 2:03.00 to add a silver medal to the one he won in the 200m breaststroke at the Olympics, while Russia's Viatcheslav Sinkevich made a late charge to win bronze in 2:03.08.