Today's calendar features European data, home prices, and consumer confidence.
European economic sentiment will be announced early in the session and could affect sentiment before the opening bell.
The Case-Shiller home-price index for May is the first release in the United States, scheduled for 9 a.m. ET. Economists expect an increase of 10.5 percent, down from 12.1 percent in April.
Consumer confidence follows at 10 a.m. ET. Forecasters are looking for a reading of 81.6, up from 81.4 in June.
Earnings also remain busy, with Pfizer, Alliance Data Systems, Alcatel-Lucent, and Barclays scheduled for before the opening bell. MasterCard, Take-Two Interactive, Allergan, and Amgen follow in the afternoon.
Wednesday is even more active, including private-sector payrolls, second-quarter economic growth and the Federal Reserve's interest-rate decision.
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