49ers' top-ranked defense major challenge for new Raiders QB

Kyle Shanahan remembers being impressed with Raiders quarterback Jarrett Stidham at the 2019 Senior Bowl. The San Francisco 49ers coach knows little else about Las Vegas' new starter. Stidham is a big unknown for the 49ers, who rank first in the NFL in scoring and total defense and figure to be a substantial challenge for a quarterback making his first career start.
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