I think we may have caught a glimpse of that on the weekend at the WGC-Bridgestone Invitational when he shot 73-73, and I'm not optimistic about what St. Louis in August is going to mean for his feels.
And then he almost lost it. It added up to a solid 3-under-par 69 and the prospect of a first win on the LPGA Tour, let alone a first major title.
The PGA Championship has seen its share of epic moments over the past century, both at match play (until 1957) and stroke play.
That made what will likely be his last-ever competitive round at Firestone a virtual practice round for next week's PGA Championship.
The course started to get a little firmer.
"Everything. I didn't warm up very well, I didn't hit the ball crisp or clean. It was pretty cool to have my grandma and grandad watching me".
But his play took a turn on the back nine.
Northern Irishman Rory McIlroy, who won the tournament back in 2014, is just three shots back after making back-to-back birdies at the 17th and 18th to take him to eight under.
The Australian raced into the reckoning with three straight birdies from the 10th, but he bogeyed the next two and then dumped a wedge into the lake guarding the front of the 16th green as he ran up a double-bogey seven. Ian Poulter shot 74. Tiger Woods is finishing up on the course.
Thomas captured his first World Golf Championship and heads to his title defense at the PGA Championship with plenty of momentum.
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"I just played like crap", said the 14-time major champion, who started the day tied for 10th and five shots off the lead and finished 11 off the pace.
"Very similar to, you know, the first day". "But it is what it is, and on to next week".
Again, Justin Thomas is good at golf. He's looking to become the second three-time victor of the event.
Thomas finished on 15 under after a one-under 69 on the final day.
"For sure, especially contending on a golf course like (Firestone)", Leishman said.
So ended a finale at Firestone that otherwise lacked drama. The numbers so good Thomas even gave the drive its own code name, playing off the TS designation.
"My irons, I just tended to hit exactly where we were picking the spots and I holed a few putts", Fleetwood said.
Firestone has held tour events since the Rubber City Open in 1954.