He broke new ground with personal bests of 13:38.30 for the 5000 metres and 27:59.77 for the 10,000 metres at the start of 2009.[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 TanzanianDickson Marwa, leaving Shelley with a personal best of 1:02:10 and the runner-up spot just one second behind.[6] In September he won the City2Surf in Sydney with a time of 41:02.[7] However, the 2009 season also brought along some setbacks for Shelley's career. He suffered a stress fracture in his leg and he also lost his funding from the Australian Institute of Sport.[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.[9] He represented Australia at the 2010 Commonwealth Games and was chosen for the marathon. 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.[10]
2011 Season
He was invited to run at the 2011 London Marathon and he reached the top ten, setting a personal best of 2:11:38 hours.[11] His second marathon race of the year came at the Amsterdam Marathon in October. Although he finished eleventh overall, he set a personal best time of 2:11:23 hours.[12]
2012 Season
Running in bib number 1059, Shelley placed 16th overall in a time of 2:14:10 at the 2012 London Olympics. The race was won by Ugandan born runner, Stephen Kiprotich in a time of 2:08:01.
2013 Season
On 13 October 2013, Shelley placed 12th in the Chicago marathon with a time of 2:13:09 which was just outside his personal best of 2:11:23. The race was won by Kenyan Dennis Kimetto in a time of 2:03:45. In the process, Shelley became the 4th Australian marathon runner to clock an A qualifying time for the 2014 Glasgow Commonwealth Games.
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.