Career
Early in his career he was successful at both 100 and 200-metre distances, winning English Schools and European Junior titles at both, but in later years he concentrated mostly on the longer distance. relay, where the quartet defeated the pre-race favourites, United States team, by just 0.01 seconds, in a season"s best of 38.07. At the championship finals, he took the bronze medal in the 200 m. Devonish retained his 100 m title at the British Championships the following year.
Foreign the 2007 season Devonish improved his performance in the 100 m with a new personal best and competed in this event at the 2007 World Championships in Osaka rather than the 200 m which he had previously specialised in.
Devonish finished 6th in the 100 m final. Devonish represented Great Britain at the 2008 Summer Olympics in Beijing.
He competed at the 4x100 metres relay together with Simeon Williamson, Tyrone Edgar and Craig Pickering. In their qualification heat they were disqualified and eliminated.
He also took part in the 200 metres individual, finishing first with a time of 20.49 seconds in his first round heat.
With 20.43 seconds in his second round he only placed fourth in his heat, but his time was among the four best losing times and enough to qualify for the semi-finals. There he came to 20.57 seconds and the seventh time in his race, which was not enough for the final. He competed at the 2009 Manchester City Games, finishing second in the 150 metres final in 15.07 seconds.
He was beaten by Usain Bolt who ran a world best-beating time.
Harry Aikines-Aryeetey, Simeon Williamson and Tyrone Edgar ran the other legs. On 16 July 2013, Devonish was bought in as sprint coach at Kingsholm Stadium, Gloucester.