Giovanni van Bronckhorst gave the hosts a deserved lead just before the half-hour mark, but Dennis Rommedahl and Siem de Jong struck after the interval to put Ajax in the ascendancy.
De Guzman´s leveller - pouncing after Theo Lucius´ penalty had been saved - 16 minutes from times sees the teams remain locked together on 25 points after 11 matches.
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