In 1996, the Padres and the New York Mets traveled to Monterrey, Mexico, to play Major League Baseball’s first regular-season series outside the United States or Canada. The Padres went back in 1999, hosting the Colorado Rockies in the first regular-season opener south of the border. Next May, the Padres could return to Estadio Monterrey. Mexican news reports on Saturday said the Padres’ May 4-6 series against the Los Angeles Dodgers, currently scheduled to be held at Petco Park, will move to Monterrey. Nothing, at this point, appears finalized. MLB officials say the league is still working through logistics.