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“I think we all let the team down at one point or another in the ballgame,” Marshall said. “We’re just taking turns.”

San Francisco featured the opportunistic, ball-hawking defense this time after the Bears came in with an NFL-leading 30 takeaways and 19 interceptions.

“Coming in I think there may have been some questions about who may have been the better defense,” Aldon Smith said. “We came out and proved a point tonight.”

NOTES: The 49ers won their fourth straight Monday Night Football game, fifth in six and seventh of 10. … San Francisco’s 43 Monday Night Football victories match the Dallas Cowboys for the most. … Bears WR Alshon Jeffery left with a knee injury in the second half.