Stock index futures pointed to a slightly lower open on Wall Street on Wednesday, with futures for the S&P 500 and the Dow Jones down 0.2 percent, while contracts on the Nasdaq 100 were down 0.1 percent at 3.51 a.m. EDT.
European stocks dipped early on and Japan's Nikkei <.N225> average fell to a three-week closing low as uncertainty surrounding a potential bailout for debt-stricken Spain and further signs of a slowdown in China rattled investors.
China's official purchasing managers' index for the services sector fell in September, showing the world's second-largest economy looks set for a seventh straight quarter of slowdown.
Automatic Data Processing releases its September employment report at 8.15 a.m. EDT. Economists in a Reuters survey expect 143,000 jobs were created in September versus 201,000 in August.
The Institute for Supply Management publishes its September non-manufacturing index at 10 a.m. EDT. A reading of 53.2 is expected, versus 53.7 in August.
Best Buy Co Inc
Monsanto, the world's largest seed company, is expected to post a loss per share of $0.43 for its fourth quarter, compared to $0.22 one year earlier. The period is traditionally Monsanto's weakest because of the seasonality of sales of its key seed products.
Marriott International, the second-largest U.S. hotelier, and retailer Family Dollar are also due to report quarterlies.
The Standard & Poor's 500 Index <.SPX> closed up 1.26 points, or 0.09 percent, at 1,445.75 on Tuesday. The Dow Jones industrial average <.DJI> was down 32.83 points, or 0.24 percent, at 13,482.28. The Nasdaq Composite Index <.IXIC> was up 6.51 points, or 0.21 percent, at 3,120.04.
(Reporting By Francesco Canepa; editing by Stephen Nisbet)