"He's been a member here for most of his junior golf career," Ninyette said. "He reads the greens well and knows the course well."
Rumford, bidding for his third European Tour title of the year, three-putted the last hole to miss a chance of breaking the course record of 64 set last year by Michael Hendry and Alejandro Canizares.
In May, Rumford became the first Australian in 41 years to win back-to-back European Tour titles when he followed up his victory in South Korea with a win at the China Open.
"Winning in front of your home crowd, there would be nothing better than that," Rumford said. "Obviously it's massive just to have won back to back this year.
"You win a couple of times and you think, 'let's go out and do it again'. But it doesn't quite happen that way and you realize how hard it is to win out here. There's so many great players, and the last nine holes of any championship can just swing so quickly. But I've got myself in position to win. I'll be working hard and that's what I'll be focusing on for the next 24 hours."