Jay Cutler passed for 183 yards on 17-of-31 efficiency, with five completions going to Brandon Marshall for 71 yards.
On defense, the Bears held the Rams to just 160 total yards.
St. Louis (1-2) fell for the 11th time in 12 road games as Sam Bradford was limited to 152 aerial yards on18-of-35 passes. He was intercepted twice in the loss.
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