US stocks opened slightly lower on Wednesday, putting the S&P 500's three-day winning streak in jeopardy after weaker-than-expected euro zone economic data.

The Dow Jones Industrial Average was down 12.11 points, or 0.09%, at 12,953.58. The Standard & Poor's 500 Index dipped 1.86 points, or 0.14%, at 1,360.35. The Nasdaq Composite Index was off 7.15 points, or 0.24%, at 2,941.42.

European shares fell for a second straight session as recession concerns increased after data showed the Eurozone's service sector unexpectedly shrank and amid residual worries about Greece despite its success in getting a bailout.