His home fans delighted since he chased an opening 64 to claim the first-round lead.
An eight birdies in his own blemish-free round to earn a one-shot guide over rising celebrity Joakim Niemann, while world # 1 Brooks Koepka birdied the 16th and then eagled the past to salvage a decent 69.
Four birdies within the first seven holes obtained An beginning he wanted and the house preferred reeled off three consecutive birdies and added the following at 16 for to eight below.
The former BMW PGA winner was not able to make the most of this past, but he had done enough to be set up since clubhouse leader and also an was delighted – and somewhat surprised – with his outstanding start at Jeju Island.
It was fantastic, eight below and bogey free is always great, he said. I hit it very solid, and I wasnt expecting it, to be fair. What appears to be working, although I didnt hit it good that the last couple days and on the range now.
Everything was going in the flag that the perfect space and I holed a great deal of putts today, so everything just clicked and I always took bogey free.
I can feel a good deal of support from people here. And playing well in front of them certainly is a bonus. Hopefully, I can keep this going.
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Niemann was only two under at the turn, but the thrilling young Chilean began the back nine with three birdies in four holes and made two more at 18 and 17 to finish a 65 .
Day has shrunk to 27th in the world rankings and has become the third-best supporting Adam Scott and Marc Leishman having not played as the BMW Championship in August, Australian, but he gave himself a elevator with a 66 which included four birdies around the turn.
His compatriot Cameron Smith is one of a group of five players under, although 2017 winner Justin Thomas carded six birdies but blotted his card bogeys in the 18th and instant holes to slip behind the leader.
Graeme McDowell stopped both nines with a pair of birdies as he also kept the mistakes at bay in a strong 68, and Ian Poulter was going well at four under with two to play prior to a bogey at the short 17th saw him slide into a tie for 15th with Tyrrell Hatton, Viktor Hovland and Koepka.
The world , who missed the cut at Las Vegas had been erratic within the next half of his around while Tommy Fleetwood mixed three birdies with two bogeys in his 71 and also also fought for consistency.
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