This market resolves to the round during which the first 1 seed loses. So if any 1 seed loses their 1st game, it will resolve Round of 64. If they all win their 1st and any lose their 2nd, it will resolve Round of 33, etc. The latest this can be resolved is if all 1 seeds make the Final 4 at which point one will be forced to lose to another. If that happens I will resolve after the elite 8 Round finishes as it will be confirmed at that point.