CHICAGO, Jan 10 (Reuters) - Spot basis bids for corn and soy were flat with few changes on Friday as market players awaited a set of U.S. Department of Agriculture reports that will be released at 1700 GMT (11:00 a.m. CST).

* The soy basis fell at a Blair, Nebraska, processor.

* The corn basis rose at a Seneca, Illinois, river terminal.

* The wheat basis fell at a Decatur, Indiana, processor.

* The USDA will release data on world supply/demand, grain ending stocks and wheat seeding.

* Chicago soybean and corn prices edged up on Friday as traders adjusted positions ahead of the USDA's crop reports, while weather concerns in South America continued to underpin the markets.

* The USDA on Friday reported export sales of U.S. corn for the week ended Jan. 2 at 445,000 tons, below trade estimates of 700,000 to 1,400,000 tons.

* The USDA reported export sales of U.S. soybeans for the week ended Jan. 2 at 288,700 tons, below trade estimates ranging from 400,000 to 1,300,000 tons.

* CBOT most-active corn Cv1 was last down 1-3/4 cents to $4.56-1/4 per bushel and most-active soybeans Sv1 were last down 3/4 cents at $9.96-1/2 a bushel.

Basis values are quoted against CBOT futures in cts/bu:

NOTE: 0 = Option price, UNC = Unchanged, UNQ = Unquoted

NC = Not comparable, DP = Delayed price, N/A = Not available,

F = January, H = March, K = May, N = JulyQ = August, U = September, X = November, Z = December

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LINKS: 0#USCSHGRN-PM

For U.S. forward basis spreadsheets, please click:

CORN/BASIS, SOYA/BASIS, WHEAT/BASIS, MILO/BASIS

- CBOT corn report COR/

- CBOT soybean report SOY/C

- CBOT wheat report WHE/C

- U.S. grain barge freight values BG/US

- U.S. Midwest cash grain PM GRA/PM

- U.S. CIF/FOB Gulf Grain GRA/F

(Reporting by Heather Schlitz. Editing by Jane Merriman)

((Heather.Schlitz@thomsonreuters.com;))