South Australia's three way election race becomes sprint for the finish.

This Saturday(17th) South Australians will cast their votes in an unpredictable election. With Nick Xenophon's SA-Best party threatening to take seats from the Liberals and Labor.

Nick Xenophon on the campaign trail Source: SBS

South Australia's three way race has become a sprint for the finish.

In the final week of campaigning, Premier Jay Weatherill and Opposition Leader Steven Marshall both made appeals to voters with their plans to boost jobs.

As Nick Xenophone, SA Best Leader, called for the redevelopment of the Port Stanvac oil refinery south of Adelaide, he challenged both leaders.

The SA Best leader is running candidates in 36 electorates out of 47.

In an election complicated by a strong third contender, many voters are uncertain.