A shift worker with only one horse in work will have his first runner at Flemington on Saturday.

Jeremy Kenny will make a six-hour trip from Millicent in rural South Australia to give Hadda Couple his chance to complete a hat-trick in the Ken Cox Handicap.

Kenny trains Hadda Couple in between shifts at a local paper factory.

The most horses Kenny has had in work is three but he's not afraid to travel, making regular excursions to western Victorian racetracks as well as Adelaide.

He will be making a rare Melbourne trip.

"I've been to Caulfield and Sandown before but this will be my first trip to Flemington," he said.

"Hopefully we can pull it off."

Hadda Couple entered Kenny's stable through an association with the gelding's half-sister Bee In Her Bonnet who he trained to win a race at Naracoorte.

Hadda Couple has already improved on that score with success at Donald on May 16 followed a Morphettville win two weeks later.

While both races were over 1600m, Kenny has no concern with a progression to 2000m.

"He's a half-brother to Letmedowngently and she won at Moonee Valley over a trip," Kenny said.

"They're very similar horses I think."

Letmedowngently is a year older with three wins to her credit and was a last-start third in the Terang Cup in April.

Adelaide jockey Shayne Cahill makes the trip to partner Hadda Couple, having ridden the gelding at his past two starts.

Kenny and Cahill have a long association, going back to when Cahill was apprenticed to Mount Gambier trainer Michael O'Leary.

"He's probably ridden 10 winners for me over the years," Kenny said.

Despite his past two victories, Hadda Couple is a $26 chance as lightly raced Warrior King and last-start Seymour winner Piran share favouritism at $6.