U.S. stocks drop sharply on euro-zone debt fears By: MarketWatch May 04, 2010 at 11:19 AM EDT Wall Street slides as worries over European national debts override positive quarterly reports from companies including drug giants Pfizer Inc. and Merck & Co. Read More >> Related Stocks: Alcoa Dow Jones Industrial Average (EOD) Lazard Inc MasterCard Merck & Co Pfizer Standard & Poors 500