The two parred the first extra hole in waning light, then mutually decided that there was insufficient light to continue playing. Now, the two will be on the 10th tee at The Moors Golf Club at 9:00 a.m. ET to determine a champion.
'We thought there was enough light to go out there,' said Hatalsky. 'Right now, we need headlights. It got a little difficult there at the end as far as reading putts.'
Sunday featured almost five hours worth of weather stoppages. There were two separate delays and the last one ended at 7:30 p.m. with the last group having to complete five holes. Daylight was always going to be a concern, so now it will be the first Monday finish on the Champions Tour since last year's Senior PGA Championship.
Thorpe shot a 3-under 67 in Sunday's final round, while Hatalsky carded a 4-under 66. The duo finished regulation at 16-under-par 194.
Defending champion Tom Jenkins shot a 4-under 66 and tied for third place with reigning U.S. Senior Open champion Peter Jacobsen (65), Fuzzy Zoeller (64) and Don Pooley (63). The group came in at 13-under-par 197.
Thorpe was one ahead with Sunday's final round to go, but Hatalsky pulled one clear when play was halted for the second time. When the two came back, Hatalsky knocked his approach to 8 feet at the 14th and Thorpe's second spun back to 30 feet. Thorpe left himself with 3 feet and Hatalsky missed his birdie try, but tapped in for par. Thorpe lipped out his par putt to fall two behind Hatalsky.
Thorpe reclaimed the lost stroke at 15 when his 5-footer for birdie found the bottom of the cup. At the par-3 16th, neither player landed on the putting surface, but Thorpe chipped to 2 feet. Hatalsky blasted out of a bunker to 7 feet, then pushed his par putt right.
The two were now tied, but Hatalsky went one shot ahead at 17 when his 10-foot birdie putt fell.
Hatalsky made a questionable decision off the 18th tee when he hit 3-wood. He had 198 yards to the pin and hit a utility club 11 feet over the flag. Thorpe's drive found the light rough and his approach stopped 8 feet from the hole. Hatalsky missed his birdie putt, but Thorpe's found the center of the cup, forcing the playoff.
The two signed their cards and Thorpe walked outside to see how much light was left. Thorpe decided that there was enough light so they went back to the 18th tee.
Hatalsky went first and split the fairway, while Thorpe found a fairway bunker with his drive. Hatalsky hit his second 20 feet right of the hole, then Thorpe hit it a foot from Hatalsky's ball.
Neither made their birdie putt so the champion will be crowned on Monday.
'I'm lucky I made that putt in regulation,' said Thorpe, referring to the putt at 18. 'We both have something to do tomorrow, but I doubt we can make it. That's the name of the game.'
If Thorpe can hold on Monday morning, he will win back-to-back starts. He captured the FedEx Kinko's Classic two weeks ago.
If Hatalsky is to win, he will collect his third win on the Champions Tour and his first since the 2003 Columbus Southern Open.
'It was a good day for us,' said Hatalsky. 'This is what it's about - good competition.'
Dave Barr (63) and Dana Quigley (67) shared seventh place at miuns-12.
Craig Stadler, who tied the lowest round in Champions Tour history on Saturday with a 60, shot an even-par 70 on Sunday. He tied for ninth place with Tom Purtzer (65), Allen Doyle (66), Vicente Fernandez (67), Mike Sullivan (68) and David Eger (68) at 11-under-par 199.