Cameron Brown has bagged his 12th Ironman New Zealand title at the age of 43 in Taupo on Saturday.
He extended his own world record as the oldest winner of any Ironman race, in the process setting a new course record.
American Meredith Kessler, who won the women's race for the fifth straight time in Taupo, also set a new course record.
Brown delivered a trademark patient and perfectly judged physical effort, stopping the clock in eight hours, seven minutes and 57 seconds for an emphatic win.
He was more than seven minutes inside the record set by Bevan Docherty in 2013, while Kessler's winning effort of 8hr 56min 07sec smashed her own record by nearly 10 minutes.
Brown climbed out of the water after the 3.8km swim in 11th place but remained calm to work his way back on the bike leg.
He finished 2min 25sec down on Frenchman Cyril Viennot, a two-time top six world championships finisher, at the end of the gruelling 180km cycle.
With Viennot badly cramping on the run, Brown and fellow Kiwi Callum Millward swept to the front and matched each other stride for stride until Brown made his winning strike shortly after the 28km mark.
"That was the toughest. And aside from that first win here, this would have to go down as the best," Brown said.
"I'm a couple of months shy of my 44th birthday so to win this for a 12th time, and set a new course record is incredibly special."
In a tight scrap for second, Great Britain's Joe Skipper enjoyed a barnstorming run to advance from seventh at the end of the bike leg to second.
He overhauled the fading Millward in the closing stages of the run to finish 1min 39sec down on Brown with Millward third in 8:10:56.
Kessler destroyed a top-quality field and shattered her own course record to successfully defend her women's elite crown.
It would have been even greater but for a wrong turn on the bike leg which cost her a further minute.
"No day is perfect. But overall you have to be consistent over all three disciplines which I did today," she said.
"It sets my year off on a very positive note and that's very exciting."
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