"You get to Cup week and the eyes of the racing world, and I think the sporting world, are on Flemington and Australian horse racing this week," said Cummings, who earlier won races with Ranier and Osborne Bulls.
"To have the colours of His Highness Sheikh Mohammed front and centre, my team there that have put the polish on these horses with me ... they've worked so hard.
"I'm a 30-year-old trainer, a battler doing my best. I've got a great opportunity here and that comes down to the wonderful support of all the team and His Highness Sheikh Mohammed and his interest and investment in Australian racing."
In truth, Cummings probably owes a little credit to the jockey of runner-up Le Romain, James McDonald. McDonald burst clear in the straight before Best Of Days came with a late surge under Craig Williams.
McDonald has ridden Best Of Days in four of his five Australian starts prior to Derby Day at Flemington.