Belt (side) isn't starting Monday's game against the Reds, Alex Pavlovic of NBC Sports Bay Area reports.
Belt will be out of the lineup for a third straight game as he continues to battle side tightness. He underwent an MRI on Monday that came back clean, and he's considered day-to-day, Kerry Crowley of The San Jose Mercury News reports. Darin Ruf will start at first base and bat fourth.