Wall St. opens lower on uncertainty over China, Greece

U.S. stocks opened lower on Wednesday as Chinese markets slid further, commodity prices fell and the Greek crisis dragged on.

The Dow Jones industrial average .DJI fell 50.24 points, or 0.28 percent, to 17,726.67. The S&P 500 .SPX lost 10.03 points, or 0.48 percent, to 2,071.31 and the Nasdaq Composite .IXIC dropped 43.45 points, or 0.87 percent, to 4,954.01.