General Comments Markets were closed for the holiday yesterday and opened at 8:30 this morning. Early calls were for lower openings, but the markets opened with slight gains. Those early gains only lasted minutes before prices turned lower led by soybeans and corn. Wheat held on to slim gains until corn and soybeans dropped to double digit losses.  Volume, as expected, was very light today with many businesses closed to make it a long holiday weekend.Weekly export sales released this morning were good for wheat at 563,000 MT and small for corn at 233,000 MT with soybean sales at 120,000 MT old crop and 249,000 MT new crop. USDA did announce the sale of 120,000 MT of soft red winter wheat to China and 120,000 MT of corn to "unknown"...