By Stephen Culp NEW YORK (Reuters) – U.S. stocks turned lower on Monday and benchmark U.S. Treasury yields breached the 3% mark at the start of an eventful week of corporate earnings, economic data and an expected interest rate hike from the U.S. Federal Reserve. All three major U.S. stock indexes reversed earlier gains as 10-year Treasury yield reached the 3% mark for the first time in more than three years. Wall Street’s sell-off extended the S&P 500’s fourth straight weekly decline, which capped its worst January-April percentage drop since 1932, as market participants girded for an expecte…