Murray ended the season as the top player in men's tennis after an incredible run of results that culminated in victory over Novak Djokovic in the final of the ATP World Tour Finals in London.
There is no doubt that the Scot has enjoyed his best season as a professional, winning a second Wimbledon crown while defending his Olympic title in Rio.
The likes of Rafael Nadal and Roger Federer were not a factor during the second half of the campaign, while Djokovic suffered with injury and a dip in form.
Whether Federer and Nadal ever again challenge for major honours is open to debate but there seems every reason to suggest that Djokovic will come flying out of the traps at the Australian Open, looking to continue his domination Down Under and knock Murray off his perch.
And, with that in mind, Smith believes the three-time Grand Slam winner will not be able to let his standards drop in order to maintain his status as top dog.
"You can imagine what his pre-season will be like," Smith told The Herald. "He will absolutely work his socks off and try to get better again.
"Now he is number one he has got to work out how to stay there and improve again. It never ends, never stops."