Alexandre Pantoja took tonight’s RFA flyweight title fight on short notice. But if he pulls off a win, it could be short notice until he’s in the UFC, he believes. Pantoja (14-2) stepped in for Joby Sanchez when Sanchez jumped to the UFC. Tonight, he meets flyweight champion Matt Manzanares (7-2), who makes his first title defense at RFA 18 at Albuquerque Convention Center in New Mexico. The main card airs live on AXS TV. “First thing, I want to win this fight