Edlefsen was recalled by the Giants from Triple-A Fresno, taking the place of Eric Hacker, who was brought up from the Grizzlies to make Friday's start and then returned. Edlefsen, a reliever, can make an immediate impact for the bullpen.
"He's a ground-ball guy," Giants manager Bruce Bochy said. "He has a good sinker and slider. He's going to help us."
Edlefsen made his Major League debut last season and showed up at Spring Training ready for more. That he didn't make the Opening Day roster was a minor disappointment.
"The initial shock of having a lifelong dream come true is out of the way," he said. "Now I can go about my business and settle down. I knew I had to be ready."
Edlefsen has a simple plan for his current tenure with the Giants.
"Throw the ball well and stay," he said.