Corn struggled to hold even minor gains overnight and today, and it was under the most pressure, probably due to the release of two private crop estimates. General Comments This long holiday weekend in the U.S. officially marks the end of the 2017 summer season. It also basically signifies the end of the 2017 growing season, although an early frost/freeze across the Corn Belt could still create some excitement. September is expected to be another below-normal month of temperatures, but there are no frost scares as of today.With the 4 September holiday in the U.S., markets will not open again until 7 P.M. (CDT) that evening.Markets were very lackluster last night despite the very strong close yesterday in corn and soybeans. There was basic...