Mustang Abigail Wagner looks for the rebound during their game on Tuesday when they hosted MCM during the first round of Region 3A action. (Photo/Sara Stadem) Matt Larson | Big Sioux Media The Tri-Valley Mustangs (11-10) advanced to the next round of the Region 3A Tournament after 57-40 win over the McCook Central/Montrose Fighting Cougars…

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