Rory McIlroy won the Tour Championship and the FedEx Cup title at East Lake in Atlanta on Sunday night. He pocketed $15 million - golf's biggest ever prize - for doing so.
McIlroy carded a 66 in the final round, finishing on 18-under, four shots clear of Xander Schauffele.
The victory ends the most consistent season of McIlroy's career, one in which he claimed three wins and 14 top 10 finishes.
Throughout the year, McIlroy spoke about not feeling excessively elated in the good moments and not too low in the bad ones.
"I think some of the work that I've put in on the mental side of the game and some of the things I've been doing, I definitely think you're starting to see the fruition of that," McIlroy said at his post-victory press conference.
You know, if I needed to get emotional and get really riled up, this isn't the sport to do that. I'm not a football player.
It's golf, and you sort of need to try to be pretty even-keeled the whole way through. Even when I made the two birdies on 12 and 13, it was great, but then when I made the two bogeys on 14 and 15, I tried to sort of treat those both the same.
And I think if you look at my bounce-back stat this year, it's way up there, and I think that's a good indication of where my mind and my attitude is while I'm out there playing.
"What I kept telling myself today, focus on the process, not the prize," continued McIlroy.
"Whether you're playing for five bucks or 15 million or whatever it is, focus on what can you do right now that's going to help you get towards your goal.
"You know, it takes a lot of mental energy to do that because it's very easy for your mind to wander, and it wants to wander and it wants to look ahead.
"But you have to be so concentrated on what am I doing and the here and the now that is going to help me get closer to that goal. And that's what I've tried to do all year. I really stuck to that today."
The 30-year-old also said that he no longer works on his swing during weeks in which he is playing.
"I try to do all of my work with my coach Michael Bannon on off weeks. This was the first tournament he's been at this year, and we didn't talk about swing, didn't talk about anything.
"I think you should do your work before the tournament starts, and then once you're there, just go with what you have, and basically that's what I did this year, I just went with what I had every week."