Martin said the filly had flourished since returning from the Gold Coast and regular rider Tommy Berry was thrilled with her.
"Tommy has ridden her fairly often in the last month and to say the least he is over the moon. He believes she has gone ahead since the Magic Millions.
"She has developed further, she has matured and she handled the trip wonderfully well.There are a couple of horses there on Saturday who have very decent form. The Gimcrack winner [Hussousa] looks very good.
"But from barrier one Driefontein should be hard to catch."
Martin has already syndicated a Slipper winner in Sebring and many of his owners have backed up with shares in Raceway.
Bred on the same cross, both Sebring and Raceway are by More Than Ready out of Flying Spur mares.
Interestingly, Sebring won the Canonbury Stakes two runs before he won the 2008 Golden Slipper.
Raceway has started just once for an emphatic four-length win despite racing greenly and is odds-on for today's assignment.
"If he reproduces the same form on Saturday he will give them something to beat," Martin said.
"He needs to win to be pretty close to securing a start in the Slipper but he may need another run as well to ensure he makes the Slipper field."
Driefontein has no such worries with A$138,000 of qualified money in the bank.
- AAP
