sentences:  On April 4, 1999, the Rockies made history as they played their Opening Day contest at Estadio de Béisbol Monterrey in Monterrey, Mexico, marking the first time Major League Baseball (MLB) commenced the regular season outside of the United States or Canada.Their opponent were the defending National League champion San Diego Padres.Vinny Castilla, a native of the southern Mexican state of Oaxaca, delighted the crowd with four hits including a double.