His only national experience was filled in as skip for an absent Mike McEwen at the 2003 Canadian Mixed Curling Championship, where he finished with a 6-5 record.
Robertson finished the 2011 Canadian Senior Curling Championships round robin with a 10-1 record and went on to beat Alberta's Brad Hannah in the final.
Kelly and his team of Doug Armour, Peter Prokopowich and Bob Scales represented Canada at the 2012 World Senior Curling Championships in Tårnby, Denmark, where they won the silver medal.
They represented Manitoba at the Canadian Senior Men's Curling Championship in Yellowknife, NWT where they lost the final 9-8 to O'Leary of NS.
At the 2014 Safeway Championship Men's Provincial Curling, Kelly along with Allan Lyburn, were named the inaugural recipients of The Pat Spiring Memorial Award.