[2] He emerged in the senior ranks in 2007, finishing in 65th place at the 2007 IAAF World Cross Country Championships and running a 3000 metres best time of 7:59.59.

[1] His third appearance at the World Cross Country Championships resulted in his best performance to date, coming in 36th place in the senior race.

[2] He returned to the Gold Coast half marathon to defend his title but he was pipped at the line by Tanzanian Dickson Marwa, leaving Shelley with a personal best of 1:02:10 and the runner-up spot just one second behind.

[8] 2010 Season Making his debut in the event, Shelley entered the 2010 Rotterdam Marathon in April and finished in twelfth place with a time of 2:13:05.

Running in only his second outing over the distance, the relatively slow pace worked in his favour as he overhauled Amos Tirop Matui in the final stages to take the silver medal behind John Kelai.

2014 Season On 27 July 2014, Shelley won the Gold Medal in the Glasgow Commonwealth Games in a personal best time of 2:11:15.