MEXICO CITY (AP) — Altitude may have helped Mexico achieve a perfect record in the group stage of this World Cup , but it isn’t likely to provide the same edge against Ecuador in the Round of 32. Mexico swept through the group stage matches at the tournament for the first time in its history, but the unbeaten run came with a caveat. All three victories took place at venues more than 5,000 feet (1,524 meters) above sea level. El Tri often capitalized late, scoring five of its six goals after