"There's a heap of cricket and loads of points on offer so we're really not focusing on the specifics of that at all," former international batsman Horne said.
"We want to make sure first and foremost that we are winning each session and if we do that then you hope that the result will come."
Auckland will be without fast-medium pair Kyle Mills and Mitchell McClenaghan, and Guptill who are on ODI duty.
The batting will be led by Raval, already with two first-class hundreds behind him in the first half of the competition, while McIntosh and de Grandhomme are also averaging in the mid-40s.
Wellington have the top scorer in the shield, opener Michael Papps, who has hit 654 runs at a whopping 109 average, while Michael Pollard and James Franklin are also averaging well over 50.
In the other two sixth round games starting today, Central Districts host Northern Districts in Napier while Otago face Canterbury in Dunedin.
Points after five rounds: Canterbury 62, Wellington 50, Otago 39, Auckland 37, ND 32, CD 27.
Auckland XI
Auckland team to play Wellington at the Basin Reserve, starting today:
Gareth Hopkins (c), Jeet Raval, Tim McIntosh, Anaru Kitchen, Craig Cachopa, Colin Munro, Colin de Grandhomme, Bruce Martin, Lockie Ferguson, Matt Quinn, Michael Bates, Dean Bartlett.