Duffy is out of the lineup for Monday's game against the Diamondbacks, Amy Gutierrez of CSN Bay Area reports.
Duffy will receive his first respite of the season, yielding third base to Kelby Tomlinson. When he returns to action Tuesday, Duffy will hope that the day off aids in elevating him above the Mendoza Line, as he's currently slashing .173/.204/.327.