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Mason rushed 14 times for 89 yards and caught his lone target of nine yards while coughing up a fumble in Sunday's 24-23 loss to Arizona.

Mason lost a fumble on his final touch in the fourth quarter of Sunday's narrow loss. The rare folly cost San Francisco dearly in the defeat, but it was also the third-year back's first lost fumble of his career. Mason still produced well on a per-touch basis and remains the unquestioned starter until Christian McCaffrey (calf/Achilles) returns from injury. A road tilt against the Seahawks on Thursday Night Football is on tap for Mason and the 49ers in Week 6.

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