Frenchman Yannick Agnel won the 200 metres freestyle to claim his second Olympic title in 24 hours as Robbie Renwick finished sixth.
Agnel, just 20, anchored the French sprint freestyle squad to victory over the United States last night when he overhauled Ryan Lochte in the final 10 metres.
Tonight he led from the start and enjoyed a dominant victory in one minute 43.14 seconds with Beijing silver medallist Park Tae Hwan and 400m freestyle champion Sun Yang sharing silver while world champion Lochte was locked out of the medals in fourth.
Renwick was unlikely to feature in the battle for medals but his sixth-place finish in 1:46.63secs was creditable.
It meant there was a new Olympic champion with 2008 title-holder Michael Phelps having opted out in London.