The South Australian election remains a genuine three horse race rarely seen in Australian politics.

ABC election analyst Antony Green believes the Liberals are on track to win the 24 seats required to form government following an electoral redistribution in the state; Labor would need a uniform swing of 3% to retain government.

South Australia Best leader Nick Xenophon is in a tight battle for the seat of Hartley with the very real prospect of losing out to Liberal incumbent Vincent Tarzia as the pressure of leading a campaign for government has become apparent.