The most-active corn contract on the Chicago Board Of Trade added 1pc to $3.41-3/4 a bushel, by 0937 GMT, after peaking at $3.42 - the highest since July 13.
Corn prices rose on Wednesday and Thursday, surprising some importers, after the US Department of Agriculture (USDA) confirmed expectations of massive US crops on Wednesday, traders said.
The tender had sought up to 276,000 tonnes for arrival in South Korea in December 2020 and January 2021, but only one of four consignments in the tender was purchased.
Russian agriculture consultancy IKAR raised its forecast for Russia's 2020 wheat crop by 1.5 million tonnes to 79.5 million tonnes due to higher yields in the central and Volga regions.