Soybeans, corn and wheat opened better than expected Sunday evening, and volume overnight was fairly strong in all three markets .USDA's announced sale of 163,00 MT of  corn  to Mexico this morning didn’t thrill the corn market, which seems focused on certain potential estimates. General Comments Soybeans, corn and wheat opened better than expected Sunday evening. Volume overnight was fairly strong in all three markets as forecasts turned a bit warmer and drier over the weekend.Last Friday’s Commitment of Traders report showed that funds started this week short 129,000 contracts of Chicago wheat futures, 105,000 contracts of corn and 17,000 contracts of soyoil. They were long 106,000 contracts of soybeans and 57,000 contracts of...