The American, who won The International Series Thailand last month, shot a first round 10-under-par 62 at Siam Country Club’s Waterside Course, in what is the Asian Tour’s first Modified Stableford scoring event.

The US$750,000 tournament is also being co-sanctioned with the Ladies European Tour.

The hooter to halt play for the day sounded as Kim was making his closing putt, during a long day disrupted by a two-hour weather delay in the morning.

“It was one of those rounds where you just look at a putt and it goes in,” said Kim, buzzing after also making birdie on 15, 16 and 17 before his grandstand finish.

“I didn’t really hit that well off the tee, I probably hit two fairways on the back nine today, but I was seven-under, so I just don’t know.

“I didn’t know what the line was, it was too dark to see. I just knew it was going a little right at the end and the horn didn’t really matter because I would have been happy to two putt in the dark, so I just hit it and it just started tracking and it went in.”

It was all smiles after another successful Asian Tour outing for Joohyung Kim. PHOTO: Supplied.

Reigning Asian Tour Order of Merit champion Joohyung Kim from Korea sits in second place on 15 points along with Hung Chien-yao from Chinese-Taipei, Indian Viraj Madappa and Rory Hie from Indonesia.

Ratchanon “TK” Chantananuwat from Thailand who claimed last week’s Trust Golf Asian Mixed Cup at the same venue was paired with Sihwan and scored seven points.

“It was an okay start, but it wasn’t great to be honest. I was one over after five holes (I started on the back nine) but I had a good birdie on 15, a good birdie on 18, so that got things going,” said 19-year-old Joohyung Kim.

“I had a really good putt on one, really good putt on two. I just kept the momentum going. We had a long rain delay and after that I had a five footer for birdie and I got anxious on it but once I got that in I kind of got going. I don’t think I had a par on my back nine. A soft couple of bogeys on my back nine but I got them back.”

“It was one of those rounds where you just look at a putt and it goes in.” - Sihwan Kim.

The two-time winner on the Asian Tour shot a six-under-par 66 with nine birdies and three bogeys; he made six birdies in a row from the 18th through to the fifth.

“That’s my longest streak of birdies in a tournament. I didn’t really realise I was on that roll and when I did I made bogey,” he said. “It’s interesting playing stableford, it’s very, very different from playing normally. You have to make a lot of birdies in this format. I think instead of playing a different format you keep playing normally and focus on what I have been doing.”

Hung fired a 65 in last week’s first round, before finishing tied for 30th, and did the same today after shooting eight birdies and one bogey.

“Last week we played the same course, and I also did really well on the first day,” said Hung, a former winner on the Asian Development Tour.

“I didn’t play a practice round here Monday and Tuesday to just get in the grove of doing the same thing on every round. The points system is a bit different, I have never played this system before and it’s the first time we have played with the ladies and it’s actually pretty fun, so we see a different side of the game, they can hit really far.

“So, I had fun last week and this week, so I am happy with my round today. I am just playing as if it’s a normal round and I had a 65 so it’s great.”

Thailand’s Jazz Janewattananond, a six-time winner on the Asian Tour and 2019 Merit list champion, scored 12 points, indicating his gradual return to form.

A total of 39 players will complete their rounds at 6.40am local time on Thursday morning.