He was just 17 years old when first contracted by the Redbacks. He played a couple of games in 2000-01 but it was in 2005-06 that he showed his talent with maiden century of 140 against Tasmania. That was followed with an innings of 149 against New South Wales at Adelaide Oval. Borgas also played a part in their one-day campaign in which they narrowly lost the final.
On October 15, 2006, he was the hero in the last over as they beat NSW in a one day game. With 18 required off the final over, he hit 3 sixes as they won with 2 balls remaining. He finished unbeaten on 31 off 9. In October 2007, he scored three consecutive Ducks (0 runs) and was dropped from the Redback's side in a struggling team.