The win opens up the next level of opportunity for Lingmerth, as the Memorial win gains him automatic entry to this year's Open Championship, the US PGA, next year's US Masters and lucrative small-field events in Asia and Europe.
Butler became a professional caddy by good luck and good timing, as much as anything.
"I came home from England nine years ago and brought a house down in Papamoa," he said. "It happened to be next door to Anthony Knight, who has been a professional caddy all his life. He caddies for Aaron Baddeley (and previously Sergio Garcia) and I got to know him really well and through him I met Phil Tataurangi.
"I had a nice job at home but I was kind of bored, and with Phil making his way over there it just came up in conversation one day. Phil asked me if I would be interested and we just took it from there.
"It could never happen that way now. It is too much of a big business over here. Phil really got me from scratch and I was pretty average for the first six months to a year. He was great, he was patient and taught me the ropes. "I worked for Phil for three years on the main PGA Tour and the tour below. Then when his health issues became too much, I started working with different guys and this year with David.
"With the (Memorial) I have gone from the doghouse to the penthouse in a day."