Club America salvaged a 1-1 draw against Toluca with an 85th minute penalty, leaving San Luis as the only team in the Mexican Clausura with maximum points from their first two games.
With every side now having played twice, only San Luis have recorded two victories but it looked as though Toluca would join them at the summit when Ivan Alonso netted in the 56th minute.
Club America hit back five minutes from time, with substitute Vicente Vuoso converting from the spot.
Unam Pumas took all three points against Morelia, with a handsome 3-0 win.
Juan Carlos Cacho (7) and Martin Bravo (39) scored in the first half, with Eduardo Herrera adding the third after 85 minutes.