Birdsong has been appointed the Giants' 27th man for Saturday's doubleheader against the Rockies. He'll start Game 2.
Birdsong will temporarily join the Giants' active roster to make his sixth big-league start of the year. Birdsong has a 2-0 record with a 3.55 ERA and 30:12 K:BB in 25.1 innings with San Francisco and will likely return to the minors after Saturday's start.