The 2018 season has been a struggle for Perdomo, who was sent to the Minors after some early struggles then missed time with a shoulder ailment. He gets the ball first in a planned bullpen day.
Kelly receives this spot start to give Madison Bumgarner his usual rest in case this weekend's series against the Dodgers has postseason implications for Los Angeles. Kelly has a 2.61 ERA in two starts this year, both in August.