 CD Oro was finally invited to take part of the 1944–45 tournament along with Puebla FC and Club León, both teams had been taking part in other amateur leagues in Mexico.At the end of the 1948 tournament the club finished tied in first place along with Club León and so a series was played in order to determine the 1948 champion.The first match ended up in a 0–0 draw, the second match was won by Club León who took their first league title with a 2–0 victory.