"I probably had too much lunch or something," said Langer, the third-round leader, who played the front nine at 6-over 41 on Sunday. "There were probably numerous shots that weren't properly executed, let's call it that way. ... But it's done with."
Haas' 7 over was the highest winning score in relation to par in the 69-year history of Senior PGA, shattering the previous high of 2 over set by Sam Snead in 1970 at PGA National at Palm Beach Gardens, Fla. It also marked the second-highest winning score in Champions Tour history, two short of Arnold Palmer's 9 over at the 1981 Senior Open at Oakland Hills.
Haas overcame a shaky putter during a topsy-turvy final round in which the final threesome - rounded out by local favorite Jeff Sluman - finished a combined 18 over for the day.
"Survived? That's kind of how I feel," Haas said following a five-bogey, one-birdie round. "I felt uncomfortable on the greens all along and made it much more difficult than it should've been."
That was a switch after Haas put himself into contention a day earlier with an eagle-2 on No. 17.
Starting the day a shot behind Langer, Haas then took the outright lead when he holed a 10-foot birdie putt on the par-3 fifth, and eventually opened a three-shot lead on the field before stumbling on the back nine.
Haas finished with 34 putts on Sunday, including a missed 3-footer for par on No. 11, and a 12-footer for par on 17.
His struggles were mirrored through the rest of the field, which produced only 73 birdies on Sunday.
Sluman had the worst day among the contenders, finishing with a 78 to drop from second to ninth.
"Frankly, I just played horrible," Sluman said.
Greg Norman, who began the day five shots back and had all but conceded a chance at winning on Saturday, closed within two of the lead after posting three straight birdies on Nos. 12-14, putting him at even for the day and 7 over for the tournament. Norman, playing only his fourth event in two years, struggled down the stretch, finishing with a 73 and 10 over for the tournament to finish tied for sixth with Don Pooley and Ron Streck.
Haas became the 13th player to win at least two Senior PGA titles after he won at Oak Tree in 2006.
"I thought that one was awfully sweet," Haas said. "But I think this one is definitely better."