Cooper had top-four finishes in all four heats at Mowbray on Sunday night to take the series by just two points from former New Zealander Kim Grant.

At 49 years of age, he is the second oldest winner of the series behind Craig Hayes who was 54 when he took out the inaugural title in 2012.

Unlike junior driver competitions, the BOTRA event is open to all drivers who are eligible to claim a concession, regardless of their age.

Like Hayes, Cooper was a late starter in harness racing and didn't have his first drive until five years ago.

He had previously worked as a raceday controller for the now defunct Tote Tasmania.

The past two seasons have been his most successful, winning a string of races with top mare Call Her Julie and, more recently, her half brother Call Me Hector.

Although Cooper had the good fortune to draw favourite Fortino in one of the heats, it was his drives on two longshots that clinched the series.

He finished fourth on $71 rank outsider Pushkin and third on $17 chance Hafter.

Mystic Journey is one of 20 entries for the $160,000 Bletchingly Stakes at Caulfield on Saturday.

Trainer Adam Trinder has earmarked the 1200m race as the launching pad for the filly's Cox Plate campaign provided the track isn't too wet.

But the weather forecast isn't good so Trinder already has a backup plan in mind.

"If she doesn't run on Saturday, she'll probably kick off in the P B Lawrence over 1400m at Caulfield three weeks later," the trainer said.

"She is due to travel over on Thursday night so I'll need to have some understanding by Wednesday on whether we push ahead or abort the trip."

Comeback sprinter Tshahitsi is also nominated for the Bletchingly after a good fifth at Flemington when resuming from a 16-month layoff.

Braccenby's win at Spreyton on Sunday capped a big week for Spreyton trainer Rowan Hamer.

He was also successful at Pakenham on Friday with smart three-year-old Aspirate.

Braccenby was coming off three unlucky runs over 1350m when his get-back style of racing proved costly.

However he was able to settle much closer over 1650m and made the most of his box-seat run to overpower Skip Town Mike in the closing stages.

With Hamer looking after Aspirate in Victoria, much of the credit for Braccenby's fourth Tasmanian win belonged to his partner Claire Pyke.

And, it was fitting that the winning rider was Hong Kong apprentice Scarlet So as the gelding had three starts at Sha Tin early in his career.

So has created a good impression since riding her first winner in early May and finished the second-last meeting of the season with a double.