U.S. stocks were tipped to open flat to slightly lower Monday, with focus turning to this week's closely-anticipated U.S. Federal Reserve meeting.
U.S. stock futures fluctuated between slight gains and losses, with Dow Jones industrial average futures last trading about 20 points lower.
The U.S. central bank meets on Wednesday and Thursday amid continued debate over the timing of the first interest rate hike in almost a decade.
Futures markets are pricing in about a 24 percent chance of a rate hike this week following recent volatility in markets, heightened concerns about the outlook for China's economy and low inflation expectations.
"Our Fed-watcher Philip Marey maintains his long-held view that December is the most likely date for the Fed's policy rate lift-off," analysts at Rabobank said in a note. "Fasten your seatbelts, as it could be another volatile week ahead of us."