Martini is out of the lineup for Tuesday's game against the Mariners.
Hunter Renfroe will enter the lineup in the corner outfield as a replacement for Martini, who had started in all but three of the Reds' past 14 games. All three of his absences had come when the Reds faced left-handed pitchers, but the lefty-hitting Martini will sit against right-hander Bryce Miller on Tuesday. Martini's move to the bench comes amid a 4-for-27 slide at the plate over his last nine games.