By Barbara Kollmeyer, MarketWatch

MADRID (MarketWatch) -- Stock futures pointed to a weaker open for Wall Street on Monday as China-growth concerns bubbled to the surface again and raised questions as to whether the record run for Wall Street is going to hit a speed bump soon.

Futures for the Dow Jones Industrial Average (DJZ4) fell 49 points, or 0.3%, to 17,163, while those for the S&P 500 index (SPZ4) lost 9.1 points, or 0.5%, to 1,994.70. Tech futures were pointing to even bigger opening losses later, with Nasdaq-100 (NDZ4) futures off 23 points, or 0.6%, to 4,070. Read: Russell 2000 'death cross' looms

The Chicago Fed national activity index for August is due at 8:30 a.m. Eastern Time, while home sales for August are due at 10 a.m. Eastern. A couple of Fed speakers are also on the calendar, with New York Fed President William Dudley due to speak at Bloomberg Markets Most Influential Summit at 10 a.m. Eastern. Dudley is a voting member of the Fed policy committee.

At 7:30 p.m. Eastern, Minneapolis Fed President Narayana Kocherlakota, also a voting member, will give a speech on the objectives of monetary policy to the Economic Club of Marquette County.

Clues about the Fed's timing intention on hiking rates and news from China are what traders will be looking out for, said Joao Monteiro, analyst at Valutrades.

China worries festering: Hong Kong's Hang Seng Index fell to two-month lows on Monday as traders fretted ahead of the HSBC estimate of China's purchasing managers index for September due after the close of U.S. markets.

Any number under 50 -- indicating contraction -- could mean more losses for Asia markets, especially barring meaningful stimulus measures. At a G-20 meeting over the weekend, China's Finance Minister Lou Jiwei said country is facing downward pressure, but won't "make major policy adjustments" due to changes in any individual economic indicator.

"We're not going to see this wall of money thrown at the Chinese slowdown," Stuart Beavis, head of institutional equity derivatives at Vantage Capital Markets in Hong Kong, told Bloomberg News.

U.S. stocks finished a volatile session on Friday mixed, but the Dow industrials (DJI) notched their 18th record close this year. Alibaba Group Holding Ltd. (BABA) was the big spotlight for that session, soaring 36% in its debut.

Stocks to watch: Investors may continue to watch shares of Alibaba for further action on Monday. The IPO is now officially the world's biggest as bankers are exercising their option to sell more shares, Dow Jones Newswires reported Sunday, citing unnamed sources.

AutoZone Inc. (AZO) will release results ahead of the market's open.

Dresser-Rand Group Inc. (DRC) was rising in premarket trade after German engineering group Siemens AG announced a deal to buy the U.S. oil-equipment maker for $7.6 billion.

Other markets: Silver (SIZ4) hit four-year lows on Monday on dollar strength and concerns about a sooner-than-expected U.S. rate hike. Gold (GCZ4) was off another $2 to $1,214.80 an ounce. The dollar itself softened a bit on profit-taking.

In London, shares of U.K. grocer Tesco PLC fell more than 8% after a profit warning due to an accounting error. China worries took a toll on mining shares, cutting into the FTSE 100 index , with other European indexes also down.

Subscribe to WSJ: http://online.wsj.com?mod=djnwires