The 29-year-old Jones, who grew up just west of Toronto in Oakville, Ont., was at the front of the pack through the 1.5-kilometre swim in Lake Ontario, the 40-kilometre bike ride past many of Toronto's key landmarks and the 10-kilometre run where he pulled away from the field to post a winning time of one hour 48 minutes 26 seconds.
Jones and Alexander Hinton of Kingston, Ont., controlled the pace while marching shoulder-to-shoulder through each of the three legs until Hinton was forced to serve a penalty during the run. That allowed Jones, a 2012 Olympian, to run to gold in the unofficial test event for the 2015 Pan Am Games that will take place in exactly one years time in Toronto.
Hinton settled for the silver medal at 1:48:35. Jason Wilson, of Barbados, was third at 1:49:36.
Meanwhile, Jamnicky, from Guelph, Ont., ran away with the women's race to capture her fist Pan American Cup title with a time of 2:03:56.
"I'm ecstatic right now," said Jamnicky. "I came in with a quite confidence. I had a plan to hang on to the pack in the swim and make the girls that I was with work on the bike. I stuck to it today and it paid off."
Jamnicky shared the podium with two American women. Johanna Gartman was in second at 2:04:58, while Erin Dolan rounded out the podium in third at 2:06:14.
Jones will now travel to Glasgow, Scotland for the 2014 Commonwealth Games.
The ITU Pan American Cup Race was being held in conjunction with the Toronto Triathlon Festival, which highlighted a weekend of sport and cultural celebrations as Toronto officially launched its one year countdown to hosting the 2015 Pan Am Games.