What to Watch in the Day Ahead - Wednesday, Feb. 4

(The Day Ahead is an email and PDF publication that includes the day's major stories and events, analyses and other features. To receive The Day Ahead, Eikon users can register at . Thomson One users can register at RT/DAY/US. All times in ET/GMT) Merck & Co is expected to report lower fourth-quarter earnings, hurt by generic competition for its Singulair asthma drug and its Nasonex allergy treatment. Investors will be paying far greater attention to the No. 2 U.S. drugmaker's earnings forecast