Duff realises Say Haya faces a tough job against some smart young horses in Saturday's Two-Year-Old Handicap (1000m).
But he believes the filly's first-up run and good trial indicate she will be competitive,
Duff and Olsen combined to win a race at Ipswich with Wicked Mama last year but Say Haya would be their first metropolitan Saturday winner.
“I would love to give Larry a Saturday winner as an owner and breeder,” Duff said.
The pair have been friends since Duff was a country trainer and Olsen an apprentice in the 1960s.
“I think Larry's first ride for me was on old Mick's Luck when they were second in a race at Doomben in 1968. We have been friends ever since,” Duff said.
Olsen raced Say Haya's dam Unica Bahaya and has bred from her since she retired.
Say Haya was second at her only start when she ran into plunge winner Combat Kid at the Sunshine Coast.
“She got a long way back after being tightened at the start but she finished better than anything in the race,” Duff said.
“Trevor Miller (trainer) has a big wrap on the winner and it was an above average Sunshine Coast field.
“Michael Cahill was impressed by my filly's trial and her run. He was very keen to ride her on Saturday.”