Former Test opener Ed Cowan has blown a chance to make a big Sheffield score, the Tasmanian falling for 68 against South Australia on Friday.

Tasmania batsman Ed Cowan blew a golden opportunity to remind national selectors of his talents against South Australia in their Sheffield Shield match on Friday.

The Tigers were 6-226 after a grinding day one at Adelaide Oval, with Cowan left unfulfilled when dismissed for 68.

The former Test opener had grafted his runs from 158 balls and appeared set for a big score to keep his fading Ashes hopes alive.

But the left-hander was openly disappointed when he was bowled by Redbacks captain Johan Botha.

He did fare better than another Ashes hopeful, Alex Doolan, who was discussed by Australian selectors before being overlooked for the first Test against England currently underway in Brisbane.

Doolan was out for a fourth-ball duck when he advanced down the pitch to legspinner Adam Zampa but missed the ball completely and was stumped.

Zampa, a New South Welshman who joined the Redbacks for this season in search of greater opportunity, was a stand-out performer with the ball for his adopted state.

Zampa claimed 2-57 from 19 tidy overs while Botha finished with 1-55.

Paceman Kane Richardson, in his first Shield match of the summer after overcoming various injuries, was the other successful bowler with 1-41 in a Tasmanian innings which also featured two unfortunate run outs.

Former Redback Mark Cosgrove was run out by Phil Hughes for 26, before Cowan and opener Jordan Silk combined a steady 80-run partnership.

But Silk’s knock ended on 63 in disastrous fashion.

The 21-year-old called for a risky single, similar to the one that resulted in Cosgrove’s dismissal, which Cowan refused to budge for.

Cowan refused to leave his crease and left Silk exposed, allowing Redback fielder Tom Cooper to comfortably lob the ball to Zampa, who tapped the bails off for an easy run out.

Doolan soon fell, and then Ben Dunk was trapped lbw by Zampa for 10, followed by Cowan’s dismissal.

And SA struck a vital blow late in the day when Richardson claimed the wicket of Tigers captain Tim Paine for 24.