He hadn't won a tournament since the 2013 Bridgestone International.
According to the PGA Tour's projected FedEx Cup standings, he still needs help to win the title.
The two-time victor of the year-ending PGA Tour event said he feels like he has always putted well on the par-70 course that is nearly 7,400 yards.
Tiger Woods is now the betting favorite to win the 2019 Masters. It started hitting me that I was going to win the tournament and I started to tear up. During the week at East Lake Golf Club, Woods ranked 3rd in driving accuracy (64 percent) and 6th in Strokes Gained: Putting.
Woods' fairy tale comeback at the PGA Tour Championship in Atlanta, Georgia, followed a two year absence from the game, in which it seemed at times he may never play again. "If I could somehow piece together a golf swing this year, I felt I could do it".
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Woods has had four surgeries on his back since 2014.
Kyle Stanley and Spain's Jon Rahm are a further three shots back on six under, six strokes behind Woods. "I started tearing up a little bit", Woods said. He's playing so well on a very hard golf course. "But I think I've been in those spots enough times that muscle memory - I guess I remembered it, and I felt comfortable in those spots".
Woods has been plagued by back problems in recent times, leading to four operations, with his recuperation so stunning he was unsure about playing competitive golf again as recently as 12 months ago. I still needed to play the hole, and once I hit the ball into the bunker" - which caused a large sigh - "I tried to miss it right of the flag.
"I just didn't want to get run over".
The 14-time major victor closed out a two-stroke victory by shooting a 71 in the fourth round Sunday at East Lake Golf Club in Atlanta.
The 42-year-old returned to golf this season after missing most of the previous two years with a debilitating back injury.