The victory takes him past $500,000 in stakes and only injury stands between him and more than doubling that tally next season.
His win gave last night's meeting a Groundhog Day feel, with the three other group ones all taken out by the horses who had won the corresponding races a week earlier.
Field Marshal went close to the race record in the Messenger when beautifully driven by Dexter Dunn, settling midfield and moving at the right time to put a gap on brave runner-up My Kiwi Mate.
He too will head to the Jewels, where reverting to mile racing should suit him beautifully but after that trainer Tim Butt may allow him to miss the New Zealand Cup. "I think a really hard Cup might be a bit much for him this year so we might look at other options," said Butt.
Marcoola quashed any doubt - not that there was much - as to his superiority in the 3-year-old trotting ranks when he led for most of the Northern Trotting Derby last night, adding that classic to the Sires' Stakes and NZ Derby, with the Jewels also next on his agenda.
But while Spanish Armada justified her hot favouritism in the $150,000 Sires' Stakes Fillies Championship, there was enough to like about the second of Delightful Memphis to suggest she can challenge the winner under the right circumstances.
Meanwhile, at Addington previously unbeaten filly Dream About Me suffered her first career defeat in 13 starts when she couldn't run down stablemate Golden Goddess in a Nevele R Fillies heat.