Bivens will start Sunday's game against the Padres, Alex Pavlovic of NBC Sports Bay Area reports.
Bivens will be making his second MLB start, with each of his last 13 appearances with San Francisco coming out of the bullpen after he tossed five innings and allowed one run in a no-decision during his start against the Dodgers on June 30. Despite being deployed in relief lately, Bivens should be relatively stretched out after he tossed four innings and 54 pitches in his most recent appearance in Wednesday's 6-4 loss to the Diamondbacks. Landen Roupp and Tristan Beck are candidates to piggyback or work multiple innings behind Bivens if the right-hander isn't able to offer the Giants as much length in a starting role as expected.