A report on the health of the service sector, and ADP's private sector jobs report are of big interest to markets that are already counting down to Friday's July employment report.

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The ISM non-manufacturing survey, released at 10 a.m. Wednesday, is expected to come in at 53.1, slightly under the 53.8 last month, but still a reflection of growth. The ISM survey also includes a closely watched employment component. ADP is expected to show a gain of 39,000 private sector jobs in July, when it is released at 8:15 a.m. Traders are also watching the Challenger report at 7:30 a.m., which shows job cuts.