Sorry if it seems I'm digging in my heels on the "equivalent" part, I should've worded that differently. If you were trying to find an equivalent Dutch sporting event to the Superbowl it would be the Eredivisie.
But the point of the analogy was not to make a perfect equivalence to the Elfstedentocht, that would be impossible. The point was to convey to an American audience some semblance of the national importance of this particular sporting event.
It's not hard to compete for that title when your competition hasn't had a televised event in 24 years...