The 37-year-old Green, who lives in Somerset, an Ohio town of about 1,500, edged England's Laura Davies in the playoff. Green, who also won here in 1994, had a clear advantage with a very vocal gallery.
"I kind of felt sorry for Laura a couple of times because people were shouting 'Go Tammie' and other stuff like that," Green said. "But it really pumped me up. I felt like my family and friends were all here."
The two players were tied at 13-under 203 through 54 holes Sunday, forcing the playoff. Green, playing one group ahead of Davies, birdied the 451-yard, par-5 18th. Davies then had a chance to win the tournament in regulation, but her 3-foot birdie putt rimmed the cup.
The playoff format at the 6,308-yard, par-72 course requires the players to play holes No. 18 and No. 10. The process is then repeated until a winner is determined.
Davies' tee shot on the final playoff hole found the left rough and left her obstructed by trees. After Green used a 6-iron on her second shot to get within 4 feet of the pin, Davies was forced to go for the green. Her second shot solidly hit a tree and ricocheted left. Green eventually eagled the hole while Davies finished with a bogey.
"It was a great tee shot, I just hit it too straight," Davies said of her last drive on the slight dogleg-right 18th. "I had absolutely no shot. I hit the tree and the rest is history."
It was ironic that Davies, the longest hitter on tour, eventually lost on a par-5, especially No. 18, which played as the easiest hole on the course for the tournament. In the playoff, both players birdied the hole the first time and eagled it the next time around. On the weekend, Green birdied No. 18 the first four times and eagled the last two.
"I guess those were two giant eagles," quipped Green. "Anytime you have to play Laura Davies on a par-5 you think you're at a disadvantage. Laura's a great competitor, a great person. She just has fun playing golf."
This was evident after the 33-year-old Davies gracefully played out on the final playoff hole. As Green was lining up her final putt, Davies was making conversation, playfully trying to distract her shot.
"I am terribly disappointed, I hate to lose," Davies said. "But Tammie Green is a great champion. Congratulations to her."
It is Green's second victory of the season she won the Sprint Titleholders Championship and fifth of her career. She has won two playoffs in five tries and is 1-1 this year. Davis dropped to 1-7 career in playoffs.
Green took home the $90,000 first-place check to take her career earnings to $2.7 million. Davies earned $55,855 for second place.
Two-time defending champion Michelle McGann shot 3-over-par 75 on Sunday to finish 3-under for the tourney. Second-round leader Brandie Burton also collapsed on Saturday. She began play at 13-under, two strokes ahead of Davies and four in front of Green, but shot 76 on the day.
Cindy Figg-Currier shot a final-round 70 to finish in third place, three strokes behind the leaders. Charlotta Sorenstam, Barb Mucha, Hiromi Kobayashi and Burton were four strokes back. Four other golfers Dina Ammaccapane, Nancy Lopez, Kathy Guadagnino and Moira Dunn finished five back.
Pat Hurst and Jan Stephenson each carded a 66 for Sunday's low score. Stephenson took the lead in the Lilly Legends Series point standings for golfers over 40 years old.