Keen to topple her will be Lucy Fell (Opiki) aboard Tinapai, who is just a single point off the leader, Natasha Brooks (Cambridge) on Kapattack and Samantha Morrison (Tauranga) on Biarritz - each of whom have won a round this season.
Both Tinapai and Kapattack are former racehorses, who have proven to be faster over showjumps than on a track.
Also in the mix tomorrow are former series winner Katie Laurie (Mystery Creek) aboard her stunning grey stallion Dunstan Casebrooke Lomond and Dunstan On The Point Eve, along with Maurice Beatson (Dannevirke) with Mandalay Cove.
Making her debut at World Cup level is the well-performed Emily Hayward-Morgan (Te Awamutu) on AP Ninja. Hayward-Morgan is in her 18th year, so just of age to enter the class. While young, she has shown plenty of talent and ability to foot it with the best in New Zealand.
Young guns Morrison with Biarritz and Lily Tootill (Auckland) on Ulysses NZPH have continued to step up this season.
Carissa McCall (Auckland) and Esteban MVNZ swept in to finish second in the last World Cup class just before Christmas, giving them plenty of confidence for a repeat performance or better this time round.
The class has also attracted entries from Tess Clark (Gisborne) on Sinatra II, Brooke and Oliver Edgecombe (Waipukurau) aboard LT Holst Aunty Annette and Ultra Blue NZPH respectively, William Willis (Auckland) on Dollar Roll MS, Mathew Dickie (Taranaki) on Quango, Daniel Blundell (Ocean Beach) with Lavello, Samantha Peters (Whangarei) on Zabambi, and Georgia Massie on Larinium LS.
The New Zealand World Cup series runs over six rounds, with the best four to count for each rider. It started in Hawke's Bay in October, and was followed by indoor competitions at Mystery Creek and Feilding, then Taupo and Dannevirke (January 8), before the grand final at Waitemata (January 14-15).
The winner of the New Zealand series has the opportunity to represent the country at the Longines FEI World Cup Jumping 2016/2017 Final which is being held in Omaha, Nebraska, in the United States, from March 29-April 1, 2017.
■World Cup (NZ series) standings after four rounds: Helen McNaught-McFarlane (Taupo) 54 pts, Lucy Fell (Opiki) 53, Maurice Beatson (Dannevirke) 46, Katie Laurie (Mystery Creek) 43, Samantha Morrison (Tauranga) 40, Carissa McCall (Auckland) 38, Lily Tootill (Auckland 37, Mathew Dickey (Taranaki) and Brooke Edgecombe (Waipukurau) 27, Tessa Clark (Gisborne) and Samantha Peters (Whangarei) 25.