After winning 400m Freestyle bronze on his European Junior Championship debut in 2012, James Guy made his mark among the senior ranks in 2013, winning 200m and 400m Freestyle bronze at the British Gas Swimming Championships.
He followed that up with double gold (200m Freestyle, 4x200m Freestyle) at his second European Junior Championships in Poznan, then made his senior international debut at the World Championships in Barcelona, lowering his British Age Group record (17 yrs) to finish fifth in the 400m Freestyle, then setting another British Age Group record (17 yrs) as the lead-off in the 4x200m Freestyle Relay as the British quartet finished seventh.
Guy finished his breakthrough season with three medals at the World Junior Championships in Dubai, landing silver over 200m and 400m Freestyle then anchoring the British quartet to 4x200m Freestyle Relay gold in a Championship record.
In 2014, Guy laid down a signal of intent with a hat-trick of golds at the British Gas Swimming Championships, taking the touch in the 200m Free, 400m Free and 200m Fly, and breaking the British record in the 400m Free.
He won his first senior international medal later in the season, lowering the British record again to claim 400m Freestyle bronze for England on his Commonwealth debut at Glasgow 2014.