Hatton became the first man to retain the Dunhill title - and only the second to win it twice - as he coasted to a final round 66 for a three shot margin of victory on 24-under aggregate of 264 - beating his own record from his victory previous year by a shot.
Another birdie on the fourth handed him a six-shot lead and while Bourdy closed the gap, a closing gain put Hatton in further control.
Runner-up Fisher also wrote his name in to the history books on the final day at St. Andrews as he broke the Old Course record with a blistering round of 11 under par 61.
"When the nine-time major champion was challenged by the Twitterati, who pointed to the placid conditions and excellent play, he replied: ".why did it take over 200 years for the course record to be broken several times this week?" Dubuisson finished with a 63 and was third, seven shots off Hatton.
Hatton's game stands up to that of any of his contemporaries, such as Tommy Fleetwood and Matthew Fitzpatrick, so if he can feel better on the course then it can only help him fulfil his potential.
"At the home of golf I wanted to try and give that putt on the last a try for 59 and it just came up a bit shy and then, unfortunately, I didn't hit a great [birdie] putt, so had to settle for a 61. We've just had good fun, I think that is what this tournament is about".More news: Twitter developing a 'save for later' feature to privately bookmark tweets
"I feel like I can still salvage something from the rest of the year".
Golf-wise, he made great strides and won five collegiate events during his four years in America. "When you get St. Andrews on a day like this, it's definitely bearable, but you still have to hit the shots".
Victor Dubuisson, who'll want to be part of the team in his homeland, produced a fantastic last round of 63 to finish third.
Fisher poured in four more birdies on the back nine to pull within three with three holes to go and enter 59 watch. You never know what could be happening behind the scenes contributing to that, but what you can say is that he seems to have turned it around. A par on the 16th hole, followed by a nifty up-and-down par save on the 17th (see below) left Fisher needing to eagle the drivable par-4 18th to break 60.
After winning this tournament 12 months ago, Steele maintained his position in the FedExCup standings for the entire season but failed to make the 30-man field at the Tour Championship. He could win it by even more this time around.