Ok, Moisés, let's see, then, on the wiki page or smarty template part.
You can enable "wiki argument variables" (Admin home > Textarea > General Settings > Wiki syntax > Wiki argument variables".
Then you can use this special syntax :
that will be parsed as your username in a normal wiki page, and probably, in a smarty template.
Another (more complicated approach) would be to play with the tracker where the itemId belongs to. You could use tracker fields "items list" ( http://doc.tiki.org/Items+List+and+Item+Link+Tracker+Fields ), I guess, to display content from the users tracker into the tracker that hold the data/runs.
But this is more work, and probably not needed if the approach with wiki argument variables works already for your needs.
So, does it help?