His home fans delighted since he fired an introduction 64 to assert the first-round lead.
An carded eight birdies in his blemish-free round to earn a one-shot lead over rising star Joakim Niemann, whilst world No 1 Brooks Koepka birdied the 16th and eagled the final to salvage a decent 69.
Four birdies within the first seven holes got An start he wanted and, the house preferred reeled off three consecutive birdies and added another at 16 for to eight below, later turning into 32.
The former BMW PGA winner was not able to take advantage of this par-five last, but he had done enough to become set up because also an and clubhouse leader was delighted – and a little surprised – along with his outstanding beginning at Jeju Island.
It was fantastic, eight below and bogey free is always great, he explained. I hit it really solid, and that I wasnt anticipating it, to be fair. I didnt hit it on the range now and great that the last couple days, but what seems to be working.
Everything was going at the flag that the perfect distance and I holed a lot of putts today, so everything just clicked and I took bogey free.
I will feel a whole great deal of support from people here. And playing nicely before them definitely is really a bonus. HopefullyI will continue to keep this going.
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Niemann was two under at the turn, however, the young Chilean started the back nine and made two at 18 and 17 to finish a 65 without a bogey.
Day has become the third-best supporting Adam Scott and Marc Leishman having not played as the BMW Championship in August, Australian and has shrunk to 27th in the world rankings, but he gave himself a elevator with a 66 which included four consecutive birdies.
His compatriot Cameron Smith is among a group of five players on five under, although 2017 winner Justin Thomas carded six birdies but blotted his card bogeys in the instant and 18th holes to slip behind the leader.
Graeme McDowell finished both nines using a set of birdies as he kept the errors in bay in a strong 68, along with Ian Poulter was moving nicely at four under two to play prior to a bogey at the short 17th saw him slide to a tie for 15th with Tyrrell Hatton, Viktor Hovland and Koepka.
The world No 1, that missed the cut at Las Vegas had been erratic within the next half of his around while Tommy Fleetwood also struggled for consistency and mixed three birdies with two bogeys in his 71.
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