But, barring bad luck, it should be a different member of Tasmania's most successful harness racing dynasty lining up to collect the trophy.

The Kent Rattray-trained Sunny Sanz will be at almost unbackable odds after his dominant win over a similar field in last week's prelude.

Rattray's brother Barrie won the race in 2011 with Beautide and again in 2013 with Pachacuti while Barrie's son Todd has won the past two with Harjeet and Izaha.

Todd's brothers Gareth (Beautide) and James (Pachacuti) also appear on the honour roll as winning drivers.

Rattray family patriarch Wayne won the third running of the race back in 1985 with Napoleon Stone when it was open to fillies and also scored in 1991 with Karalta Jet.

Sunny Sanz won his only three starts as a two-year-old before being sidelined by injury.

He has won two of his three starts since returning, suffering his only defeat behind smart filly Spoilt Sport in Hobart when Rattray said he "got fired up."

His prelude win was outstanding as he lost ground after locking wheels with a tiring runner in the back straight.

He appears to be clearly the best horse in the final and it would be hard to begrudge him a win.

"I feel like we left a lot of money on the table last season when he got injured and this is a good opportunity to make up for some of that," Rattray said.

Former King Island galloper Debseraa has had his winning run interrupted by a virus but could pick up where he left off at Spreyton on Sunday.

Trainer Adam Trinder expects the four-year-old to be hard to beat in the Benchmark 64 Handicap where he is chasing his seventh consecutive win.

Trinder said that Debseraa "picked up a bug" after his most recent win at Spreyton on April 14.

"He went off his feed and picked up a temperature so we backed off and treated him," the trainer said. "He seems good and bright now.

"He's had a soft trial to take away a little bit of his freshness but still leave a bit of bounce in him going to the 1000m.

"He's a really progressive horse so I expect him to be highly competitive again.

"He's got really good talent but he's not truly consistent with his breathing rhythm which is going to hold him back (long term)," the trainer said.

No date has been set for the resumption of the Eastender/Adelaide Cup inquiry.

The South Australian racing integrity office said it would most likely continue late next week.