Play has been suspended until Monday local time at the event because of storms in the area with Ruffels in the clubhouse at 16-under and tied for the lead with several groups yet to complete play.
Among those still on course is co-leader Jose Toledo who has three holes of his final round to complete.
The tournament was reduced to 54 holes because of storms earlier in the week and Ruffels said he knew there was a sense of urgency when he teed off early in the day.
"I knew at the start of the day we were going to have at best, 54 holes, and I was a long way back, so I knew I had to make something happen a little bit,” he told the PGA Tour Latinoamerica website.
"It's definitely a gettable golf course. The greens are quite soft, and you can go out there and make a number. I knew guys had done that.''
The top five finishers on the Tour’s Order of Merit at the end of the year gain access to the secondary Web.com Tour and Ruffels presently lies 43rd in the standings though has only played two of the six events staged so far.
CURTIS LUCK EXPLAINS WHY HE LOVES GOLF:
Want video tips delivered straight to your inbox? Subscribe to iseekgolf.com newsletters.