The putt gave him a final round 69 and a two shot lead over Mark Calcavecchia, Tom Kite and Bernhard Langer.
The 56 year old had made bogeys on three of the previous four holes and looked like blowing the buffer he had built up over the field at the Newport Beach Country Club in California.
“We did make it interesting,” Roberts said after finishing on 8-under. “We got off to the start you dream of doing, but hit a snag on the back.”
Roberts had begun the day two strokes behind Calcavecchia but made birdies on three of his first four holes.
“I kind of let everybody in the game,” Roberts said. “I got out of rhythm. I didn’t hit bad putts. The only bad putt I hit was on 12.”
Roberts now has 13 Champions Tour wins to add to his eight PGA Tour victories.
Australia’s Peter Senior (72) got his final round off to a good start with a birdie on the 1st but a double bogey on the par three 4th and further bogeys on 7 and 8 certainly slowed his momentum. He made another good start to the back nine with birdies on 11 and 12 and more on 15 and 18 but they were offset by bogeys on 13 and 17.
He finished on three over for the 54 holes tied for 43rd position, his worst finish on the tour for some time.
The Champions Tour moves to Mississippi this week for the Mississippi Gulf Resort Classic in Fallen Oak, Biloxi, where Tom Lehman is the defending champion.2012 Toshiba Classic Final Results