Sundees Son is back at the distance he was born to run.
With barrier three and the chance to go searching for the lead inside the first lap, he is red hot and Dunn says the race and preparation has come together perfectly.
"He has a good barrier and the manners to use it and it wasn't that he was getting tired last week, I just went slower than normal," says Dunn.
"He was trotting about as fast as he can go that last 400m and Bolt can trot those sectionals even faster but we can trot at that speed for longer.
"So I will drive him more like that this week and he is spot on. I am very confident even allowing for the quality against him."
Highgrove is also trained by the Dunn family and looked the best three-year-old trotter until last Friday when he galloped at the start of his race and then rival Masterly produced a stunning victory to confuse the pecking order.
"The mobile was going too slow last week which it does up here for the trotting races sometimes and that, along with him being drawn on the inside, didn't help him," says Dunn.
"He is drawn out wider this week and that will help and before that he had been trotting well so I am confident he will trot away."
So will that equate to beating Masterly?
"It will be a very good race because Masterly was pretty impressive last Friday.
"Sure, I think I can beat him but it will be worth watching."
The Auckland Cup is dominated by Self Assured but Dunn isn't willing to concede just yet with A G's White Socks.
"He is flying and has been huge his last two starts and I think we have a real hope if we have some luck.
"A lot will depend on the start. He is on the unruly and so are the other horses who might try to park out Self Assured if they get in front of him, Cranbourne and South Coast Arden.
"If Self Assured gets in front of us all then he could get thing his way and be very hard to beat.
"But A G's is racing so well if Self Assured has any bad luck we might be in with a show. I think he can win."
Incredibly, A G's White Socks' last win in New Zealand was at Alexandra Park in December 2019 when he was one of the stars of the Inter Dominion series. That night he beat two All Stars Group 1 performers in Chase Auckland and Thefixer.
If he can repeat that tonight, Dunn will be in for the night of his life.
TIPS FOR THE CUPS
The multi anchor: Sundees Son (R7, No 3): Has been unbeatable over 3200m with all four distance wins at Group 1 level. Expect him to win so anchor him in everything.
The other Cup: Self Assured (R8, No 4): Also has a stunning 3200m record, having won the NZ, Auckland and Easter Cups, and should win. But comparing the two hot favourites' dividends, Self Assured has more realistic ways to get beaten than Sundees Son.
Split bet value: Harder Than Diamonds (7) and Mimi E Coco (5) in race 9. The favourite Manhattan can win but is short and the two northern mares have both shown enough to suggest they can beat her. Harder Than Diamonds was off colour last time she raced but has been treated since and worked well with Cranbourne on Saturday. She looks the best each-way of the night.
Lost and found: Son Of A Sun (R3, No 4): Worked hard to lead last week but drawn closer in on unruly this week. Didn't know what to do when headed in the home straight but should be better for that and looks the winner in a weak field.
The next great rivalry: Highgrove vs Masterly (R5): Highgrove looks freakish at times but Masterly looked freakish and better behaved last Friday. If they both trot throughout and produce their best? Highgrove gets a narrow points decision.