Tiziani, the brother-in-law of PGA Tour winner Steve Stricker, added a 4-under 68 to his pair of 67s for a two-shot lead at 14-under-par 202. The St. Paul, Minnesota resident, who led by one stroke through two rounds, was followed by Chad Wright, of Ventura, California, who surged to 12-under with a third-round 63.
Wright, the 2000 Canadian PGA Championship winner, fired a course-record 10-under 62 in the final round here a year ago to finish third.
Americans David Kirkpatrick (66), David Ladd (69) and Patrick Moore (72) were five off the pace at 9-under, while British Columbia's Darren Griff (70) was the highest-positioned Canadian, at 5-under.
Steve Runge, the defending champion, will head into the final round tied for 63rd at 5-over 221.
Sunday's winner will collect a check for $40,000.