Giants, Marlins switch to bullpen game

Add Alex Cobb to the list of absentees for the San Francisco Giants as they play the Marlins in Miami on Friday night.

The Giants announced hours before game time that right-hander Cobb was experiencing lower back tightness and will miss his scheduled start. He'll be replaced by John Brebbia (3-0, 3.32 ERA). It will be the first major league start for Brebbia in what will be a bullpen game.

Miami will counter with left-