EMERGING MARKETS-Mexican peso slips in worst week since January

(Updates prices) By Mitra Taj and Miguel Gutierrez MEXICO CITY, April 21 (Reuters) - Mexico's peso eased on Friday amid global jitters over the French election, posting its worst weekly loss since the start of the year. Markets braced for the first round of the French presidential election on Sunday ahead of a runoff between the top two candidates on May 7. In Mexico, Latin America's No.2 economy, the stock index also weakened ahead of first-quarter earnings that many Mexican