Olympics: Swimmer Dan Wallace claims silver in relay
The Warrender swimmer, 23, was forced to shake-up his system ahead of Rio by moving back to the UK from Florida and desperately hoping he could make the changes required to contribute in Brazil.
But in tandem with fellow Scots Stephen Milne, Duncan Scott and Englishman James Guy, he pulled out a superb third leg that helped the British squad see off Japan with the USA long gone out of sight.
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Hide AdMeanwhile, Craig Benson missed out on a spot in the 200m breaststroke final after coming seventh in a semi-final won by British team-mate Andrew Willis.
The 22-year-old from Livingston nudged out training partner Ross Murdoch from the team via the UK trials but he could only match his finish from London 2012 despite a quicker time than his heat that left him an unlucky 13th.