"He texted me to tell me he won and played great down the stretch," Rookes said.
"He showed some signs at the beginning of last year. He did well at the New Zealand Amateur and a number of tournaments, and attended some national training camps.
"The basic feedback was he needed to tidy up his basic technique a lot more and he has worked really hard on getting his technique tighter.
"He has relied heavily on his short game over the years so he has worked extremely hard on getting his long game to match his short game.
"Now he has his technique and lines pretty much where we want them. I always thought it was just a matter of time before he turned a good performance into a win.
"His size has always hindered him but as he has got physically stronger he can now support the stresses of the swing and his swing has become a lot more solid."
Smith is straight back into action today when he tees it up at the highly regarded Golf South Australia Junior Masters at Royal Adelaide Golf Club.