Wall Street set to open slightly lower

Wall Street was set to open slightly lower on Tuesday as investor braced for a weak corporate reports for the quarter and as retail sales unexpectedly fell in June, which could raise concerns the economy was slowing again. U.S. companies are expected to report their worst sales decline in nearly six years when they post second-quarter results, while earnings are expected to have fallen 2.9 percent, according to Thomson Reuters estimates data. "The focus is shifting from macro factors to mic