U.S. stock index futures were mixed on Tuesday as a number of companies posted quarterly results.
Johnson & Johnson, Verizon, Travelers, DuPont and Alibaba were among the companies that reported earnings before the bell.
Texas Instruments, Alcoa, Capital One, Discover Financial, Intuitive Surgical, Seagate Technology and Stryker are all due to report after the market close.
On the data front, Tuesday will see Purchasing Managers Index (PMI) released at 9:45 a.m ET with existing home sales and Richmond Fed survey data due at 10 a.m ET.
In Europe, the pan-European Stoxx 600 index was around 0.1 percent higher on Tuesday morning. In Asia, the Shanghai Composite in China closed 0.2 percent higher, while the Nikkei in Japan closed 0.55 percent lower.
In oil markets, prices moved higher on Tuesday after evidence that OPEC and other oil exporters would commit to reducing production however an increase in drilling in the U.S. could cap further gains.
Brent crude traded at around $55.65 a barrel on Tuesday, up 0.76 percent, while U.S. crude was around $53.16 a barrel, up 0.76 percent.