So much so John pulled out of the one-one to sit parked at the bell and destroyed his rivals in a new national record for the 3200m.
"It is special to have a trotter like him, especially at this stage of my career," says Robert Dunn.
"For years we didn't train many trotters but now we have about 20 in work. But to win these major trot races, when we have so many great trainers of trotters in this country, is very special."
The Dunns will now weigh up whether to bring Sundees Son north for the series of major trots over summer or back off and wait for the autumn Group 1 races.
If he does come north it sets up a mouth-watering clash for harness fans between him and 4-year-old excitement machine Bolt For Brilliance.
So dominant was Sundees Son he even overshadowed Spankem's brilliant win in the $180,000 NZ Pacing Free-For-All after a massive plunge by punters.
Spankem opened $2.40 but was backed into $1.70 holding six times the money of stablemate Amazing Dream and the race was as good as over after 150m when he worked to the lead. He then set his own terms and bolted clear at the top of the straight to gain some hefty compensation for his Cup second on Tuesday.
Spankem, Cup-winning stablemate Self Assured and the free-for-all's luckless runner Amazing Dream will now all head north for the Alexandra Park carnival next month.