Blach has made San Francisco's Opening Day roster and will be used as a reliever to open the season, Alex Pavlovic of NBC Sports Bay Area reports.
Blach was given some starting opportunities in camp, but wasn't quite able to do enough to oust any of San Francisco's veteran starters from the rotation. Expect Blach to work in the bullpen, but given his Triple-A success as a starter last year (3.43 ERA, 1.14 WHIP over 162.2 innings), he could very well be the first option for a spot start should a Giants starter fall to injury.