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The All Stars trainers look set to continue their dominance of the juvenile feature with Copperfield and Flying Even Bettor.
The pair filled the trifecta behind their star stablemate Smooth Deal in last month's group 3 Sapling Stakes at Ashburton.
Flying Even Bettor clearly put in a more impressive run to beat his stablemate in that race.
Copperfield had a perfect run in the trail and just battled into third placing.
After going roughly on the home turn, Flying Even Bettor produced a big late finish to run second.
Despite that, Purdon said there was little between the two horses going into tomorrow's race.
''Flying Even Bettor and Copperfield are both well and are working up fine,'' he said on his stable's website.
''There is not a lot between them and the run will decide the outcome.''
The All Stars pair take on just five other runners in the $30,000 one mile feature.
The Robert Dunn-trained Tyron Terranova is the only other runner in the field with race experience.
In his only start, the pacer set up the sedate race tempo in the Sapling Stakes before fighting on for fourth.
If Flying Even Bettor is able to win it could make for a memorable day for Ocean View breeders Lex and Heather Williams.
The pacer's older half-brother, Flying Mister Ideal, looks a big chance in tomorrow's Wyndham Cup.
Both pacers are from the Williams' broodmare, Flying Mrs Williams.
Trainer Brendon Hill has warned that Flying Mister Ideal will not be at his absolute peak for tomorrow's 3200m feature.
The pacer will be having his first start since November in the event.
''It is a bit risky first-up over two miles,'' Hill said.
''He is as forward as I can get him for two miles, which is a little bit of a worry - the other horses are race fit , where as he is not.
''I am confident he will go a good race so long as he steps nicely, which he has done in the past.
''He will be right there, it is just that the two miles is a bit of a worry.''
Flying Mister Williams' main rival does not have the same fitness concerns.
Vintage Cheddar has had three starts back to ready him for 3200m.
His last visit to Wyndham produced an excellent standing-start win, when he broke three minutes for 2400m against moderate opposition.