At 14-under-par 199, Hall leads by a single stroke over second-round leader and playing partner Jim Thorpe, who shot a 68 Sunday, and by two shots over Argentinas Vicente Fernandez, who went around Mississauga in 66.
Bruce Fleisher (67) and Tom Kite (66) are at 11-under, four shots off Halls pace.
With six second-place finishes in his five years on the Senior circuit, one might think Hall could be nervous entering the final round on Sunday.
Not true says the man from North Carolina.
'I'm on holiday every day,' claimed Hall following his round. 'I had a day job for 20 years, so my wife and I are out here on vacation every day. All I want to do is play well. If I win, I win. If I don't, I don't.'
One thing is sure ' if he putts like he did on Day 3, there will be no catching Walter Hall on Sunday.
Following a bogey at the 15th, Hall responded with 10-foot birdie putts on Nos. 11, 12 and 13, and followed it up with another 10-footer for par at the par-4 15th.
He capped off the day at the closing 18th hole, when one more 20-footer found the bottom of the cup.
Said Thorpe: 'That's probably the greatest putting round I've seen since I've been on the senior tour. If he putts like that tomorrow, we can't beat him.'
Thorpe also birdied the 18th in his round of 68. In all, he had three birdies against just a single bogey at the par-5 5th.
Fernandez also made just one blemish on his round, but he backed it up with four red numbers on the front nine, and two more on the back for his 66.
Due to thunderstorms in the forecast for Sunday afternoon, players will go off of both sets of tees for the final round. They will also tee off about 2 hours earlier than originally scheduled, with the leaders expected to head off at approximately 9:54am.