PSV 's main rivals for the title , defending champions Ajax Amsterdam , celebrated the novelty of having the roof of their new 51,000 seat stadium closed against the rain , with a 1-0 win over AZ Alkmaar .
<response> <organization>PSV</organization> 's main rivals for the title , defending champions <organization>Ajax Amsterdam</organization> , celebrated the novelty of having the roof of their new 51,000 seat stadium closed against the rain , with a 1-0 win over <organization>AZ Alkmaar</organization> . </response>