Sanmartin is scheduled to start Sunday in the Reds' season finale against the Pirates in Pittsburgh, C. Trent Rosecrans of The Athletic reports.
Cincinnati will reward Sanmartin with a second turn through the rotation after he shined Monday in his MLB debut, which also came against the Pirates. The 25-year-old lefty covered 5.2 innings in the outing, giving up a run on five hits and a walk while striking out five en route to capturing the win. The Reds freed up a spot in the rotation for Sanmartin by moving Vladimir Gutierrez to the bullpen.