June 11 (Reuters) - Mexico's peso slipped from a three-week high on Friday after an unexpected drop in May U.S. retail sales dented the outlook for Mexican exports.

The peso MXN=MEX01 lost 0.36 percent to 12.7309 per U.S. dollar.

Data showed sales at U.S. retailers fell in May for the first time since September. The report added to concerns the recovery in the United States, Mexico's top trading partner, may be losing some steam.

Mexico's is playing in the opening game of the soccer World Cup, and local traders said volume was expected to fall off drastically once the game begins at 9 a.m. local time (1400 GMT). Some local desks closed positions on Thursday, traders said.

Mexico's peso fell sharply in April and May on concerns Europe's debt crisis could weigh on the global economic recovery, but the currency has recently been paring losses. (Reporting by Michael O'Boyle; editing by Jeffrey Benkoe)

Mexico Retail sales U.S. Retail