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Auckland are the only unbeaten team heading into the final round of the Toro Women's Interprovincial at the St Clair Golf Club in Dunedin.
The 20-time champions were less than convincing again on day four of the national team's championship, but they won the big moments to be in a dominant position with one round to go.
Auckland are all-but safe in division one, while Waikato and Canterbury will fight for the remaining semifinal place.
Canterbury has the easier passage to the final four as it meets hosts Otago in the last round while Waikato, who last won the event back in 2008, must beat the defending champion Auckland team to advance.
Canterbury No 3 Jess Guezenrodt, who has won five games out of five this week and is contention for the player of the tournament honours, knows her team has everything to play for tomorrow.
"Our main goal was just to make it to the semis," said Guezenrodt. "We really wanted to make a big improvement on our efforts at this event from the last couple of years.
"We have got a great team spirit and every day we go out and we really try. The team has bonded really well and it's much better than it has been in previous years."
Meanwhile, in division two, Wellington and North Harbour are top of the group with four wins from five matches while Bay of Plenty and Manawatu/Wanganui all still have a semifinal chance.
Southland and Wellington will square off and Bay of Plenty faces North Harbour in two crucial showdowns. Manawatu/Wanganui has to beat Northland and hope Wellington loses to advance.