Views of products just showing the first time a taxonomy term is used?
Did you build your view based on nodes or on taxonomy terms? (https://drupal.org/node/770782)

I think a taxonomy terms based view is the preferred way. Maybe you already did this.


  1) add a new view of view type "term" (not the default "node" option!)
  by ticking the correct option after clicking 'add view'
  
  2) add the Taxonomy Term to the list of Fields
  
  3) Add a relationship "Taxonomy: Node" and make it obligatory
  
  4) In the basic settings enable the 'distinct' option.
  
  5) Add some filters to narrow the results as needed. 


When setting filters you can try to use a contextual filter Term-ID with a default value set from the node page, only from the term list sports. You will also need to set a normal filter with term list product category.