The line for the San Francisco 49ers Week 10 matchup with the New York Giants opened with the 49ers installed as one-point favorites. By Wednesday morning, they were one-point underdogs. Since then, the line has changed even further. Our friends at Odds Shark track lines across the Internet and in Las Vegas, and the 49ers are either a 2.5- or three-point underdog at various sportsbooks.
I thought this was due to the question marks at the quarterback position. Some sportsbooks might have figured if Jimmy Garoppolo takes over the starting job, that changes the 49ers value.