Ryan Lochte of US reacts after setting a new world record in the men's 100m individual medley at the World Short Course Championships.

Istanbul – America's Ryan Lochte set a new short course world record in the 100m individual medley on Saturday when he clocked 50.71sec in the semi-finals at the world championship.

The five-time Olympic champion knocked .05sec off the old mark set by Slovenia's Peter Mankoc in Istanbul in 2009.

Lochte had also set a new world record on Friday in the 200m medley. – Sapa-AFP