Mostert was tracked running at 22.73 MPH on the score by Next Gen Stats. It's the fastest speed reached by a running back over the last three seasons and gave the 49ers a 10-0 lead.
San Francisco currently leads the Cardinals 10-7 at Levi's Stadium.
Mostert is in his fifth season with the 49ers after initially signing to the practice squad late during the 2016 season. The running back led the team in rushing in 2019 with 772 yards and eight touchdowns on 137 carries. He also added 180 receiving yards on 14 catches with two more scores through the air.
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