Danny Castillo vs Isaac Vallie-Flagg booked for UFC 172

This may be the "Last Call" for Danny Castillo to make a run at the division title.

Ultimate Fighting Championship (UFC) veteran Danny Castillo looks to get back into the win column when he battles fellow hot-and-cold lightweight Isaac Vallie-Flagg at the upcoming UFC 172 pay-per-view (PPV) event, which takes place on April 26, 2014 inside Maryland's Baltimore Arena.

UFC announced the booking earlier today.