Wall Street was set for a flat open on Wednesday as investors waited to hear from the U.S. **MERCK& CO INC, Tuesday close $47, down 5 pct premarket. **CHESAPEAKE ENERGY CORP, Tuesday close $19.54, up 5 pct premarket.
**MERCK& CO INC, Tuesday close $47, down 3 pct premarket. **CHESAPEAKE ENERGY CORP, Tuesday close $19.54, up 4 pct premarket. **GENWORTH FINANCIAL INC, Tuesday close $10.03, up 5 pct premarket.