Compatriot Im Sung-jae and American John Huh tied for second at 15-under.
The triumph sees Kim automatically join the Tour as a full-time member and stamps his ticket to the FedEx Cup Playoffs next week, where he will compete to qualify for the Tour Championship at East Lake, Atlanta, in August.
After six tournaments in under two months — including top-50 finishes at the US and British Opens — the youngster’s recent breakneck journey looks set to be extended.
“I’ve been home two weeks this year, so I was like, ‘You know what? Secure my PGA Tour card for next season, I can go back and relax for a week,’ but I guess that’s not going to happen,” Kim told reporters.
“It’s going to be my eighth week in a row if I make it to the Tour Championship. It’s a lot of golf, but I’m enjoying it and I’m honored to play on the PGA Tour, it’s incredible.”
Thomas the Tank
It was a historic win recorded in historic fashion as Kim, having shot a quadruple bogey on his opening hole of the event, tore through the front-nine on the closing day.
A bogey at the 10th provided the sole blemish on the 20-year-old’s scorecard, as back-to-back birdies at the 15th and 16th put the gloss on a resounding win, made all the more impressive given the disastrous start.
“It’s crazy. I’ve never won a golf tournament starting with a quad,” Kim said.
“I told myself from the start of the week, ‘Just have fun, enjoy it, you’ve got your card already, just enjoy every single moment of it and just have fun and just don’t get too intense about it.’
“But this back nine was crazy, it was probably the most intense round I’ve played. My putter felt like 200 pounds today, I’m not going to lie.”
Quizzed on his nickname, Kim said he had named himself as a child after the beloved fictional train, Thomas the Tank Engine. Pushed on by chants of ‘Let’s go, Tom’ throughout, one of Kim’s clubs features a symbol of the famed blue train.
“You’re supposed to let your parents name yourself and I was like, nope, I’m to name myself Thomas,” Kim revealed.
“I loved the show as a kid. I haven’t watched it or anything, but apparently, I really loved the train … as years went on, people started calling me Tom, it was shorter, so I went with Tom after that.”