Kiwi Ryan Fox has fired a final round two-under 68 to finish tied for 27th at the PGA Champioship.

Fox finished the tournament at six-under, 10 shots behind winner Brooks Koepka. It is the Aucklander's best finish at a major after coming in a share of 39th at the Open Championship last month.

It is the third straight major that Fox has finished in the top 50.

Fox had six birdies and four bogeys in his round and earns US$82,000 for his efforts, taking his total prize money earned in 2018 to more than $NZ2.7m.

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"I'm definitely happy but a little bit frustrated as well," Fox said admitting he probably should have done better in his third round to be closer to the leaders today.

"Good to know that maybe not my best golf of the week could still see me finish pretty high in such a big event."

"Hopefully my time in one of these big events will come around soon and I can string four decent rounds together," Fox told Radio Sport.

Fox said the crowd was the best he's come across especially when Tiger Woods was in contention down the stretch.

"It was unbelievable. I have never seen anything like it. The crowds for the week were the best I've seen at any tournament. It was six or seven deep down a lot of holes, even for us in not a big named group," Fox said.