U.S. stock index futures held their gains Tuesday following the latest S&P/Case-Shiller housing report and ahead of the Federal Reserve's meeting.
On the economic front, single-family home prices rose 1 percent in May on a seasonally adjusted basis, according to the S&P/Case-Shiller composite index of 20 metropolitan areas. Economists polled by Reters expected a gain of 1.5 percent.
The Conference Board is scheduled to release its monthly consumer confidence index at 10 am ET.
Among earnings, Merck topped profit expectations but showed weakness on revenue, sending shares lower pre-market.
Pfizer gained after the U.S.'s largest drugmaker posted numbers that were slightly ahead of expectations.
And BP posted a second-quarter profit that missed analysts' expectations, and warned that its $20 billion oil-spill compensation fund has almost run out. After the numbers were out, CEO Bob Dudley told CNBC that class action lawsuits like the ones BP is facing in the U.S. are a "business model" that serve only to benefit attorneys.