How do you know it's initialized? Why don't you put a statement in so you can tell what's actually being retrieved from the database:

# Also, you should use 'my' to ensure you get a new
# array every time
       
while ( my @row = $sth5->fetchrow_array() ) {
      $round= $row[0];
      $teamname= $row[1];
      $score= $row[2];

      # If you're running in a webserver, this should
      # appear in the error log. You can also try
      # to print this out to the browser.

      warn "Retrieved row: ($round) ($teamname) ($score)\n";

      $list_of_teamdata[$pain][0] = $round;
      $list_of_teamdata[$pain][1] = $teamname;
      $list_of_teamdata[$pain][2] = $score; 
      ...     
}
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Chris
M-x auto-bs-mode