Jones produced the best back nine of his life - a six under par 30 at Paraparaumu Beach - to win his first national title.
The 19-year-old headlines the field at the Poverty Bay Golf Club alongside NZSP runner-up Nick Voke, as he looks to build on what he achieved on the Kapiti Coast.
The former winner of the Michael Campbell Foundation Scholarship said it was a special feeling to win after finishing runner-up so many times.
"It was awesome to finally win a big event and the way that I did it was really cool," said Jones following his win. "I want to carry on playing like this in the next few events and get into contention for another one."
Jones will also play the Taranaki Energy Open on the Charles Tour and then the New Zealand Amateur at the Manawatu Golf Club.
In the women's competition, 11 of the top 20 Order of Merit are playing, with Cassidy also looking to back up her win. The challenge is expected to come from well performed Auckland golfer Brittney Dryland and Waikato No 1 Sarah Bradley.
There will be a new winner of both championships in 2013 as last year's winners Daniel Pearce and Emily Perry have both since turned professional. Interestingly, the last player to win this event, that didn't go on to turn professional, was Chris Johns in 1999.
The North Island Stroke Play title has been won by many of New Zealand's best golfers over the years since it began in 1938.
Past champions of the men's trophy include Bob Glading, Stuart Jones, Ross Newdick, Marcus Wheelhouse, Mark Brown, Tim Wilkinson, Bradley Iles, Josh Geary and Danny Lee.
The women's championship has only been running since 2008 and in that time World No.1 amateur Lydia Ko won it three consecutive years, from 2009 to 2011.