http://www.mmajunkie.com/news/2013/0...-1-3-in-brazil

A welterweight contest between two fighters looking for their first UFC win is the latest addition to September's UFC on FOX Sports 1 3 event, as Sean Spencer (9-2 MMA, 0-1 UFC) meets Yuri Villefort (6-2 MMA, 0-1 UFC).

UFC officials today announced the new matchup.
With the addition to the card, the UFC on FOX Sports 1 3 lineup now includes:

Ryan Bader vs. Glover Teixeira
Yushin Okami vs. Ronaldo Souza
Joseph Benavidez vs. Jussier Formiga
Sean Spencer vs. Yuri Villefort