Dan Wallace showed plenty of promise as a junior swimmer, qualifying for consecutive European Junior Championships in 2010 and 2011, medalling twice at the latter with 200m Individual Medley silver and 400m Individual Medley bronze.
He moved to USA for the 2012 season, training under Gregg Troy at the University of Florida, before returning to British shores for two sixth-place finishes in the respective Individual Medleys at the 2012 British Gas Swimming Championships in London.
The following season saw Wallace make his mark both domestically and internationally, landing 400 IM bronze at the NCAA Championships then 200m IM bronze and 400m IM silver at the British Gas Swimming Championships.
Wallace continued his form into his debut World Championships in Barcelona, reaching the 400m Individual Medley final before clocking a Scottish record to finish seventh.
In 2014, competing in front of a home crowd for Scoland at the Glasgow 2014 Commonwealth Games, Wallace set a British record to win 400m Individual Medley gold, then added 200m IM silver and a second silver with the 4x200m Freestyle Relay quartet.