Brock Purdy isn't necessarily a product of Christian McCaffrey, but he's so much better when McCaffrey is on the field. When McCaffrey plays, Purdy's passer rating is 111.9 and his win-loss record is 18-4.

Don’t expect the San Francisco 49ers to take their foot off the gas in their usage of running back Christian McCaffrey. McCaffrey returned in Week 10 after missing the first nine weeks to work through Achilles tendinitis. It stood to reason that his usage might start slow and then ramp up.

Here are some key trends and stats to see before placing any bets on Christian McCaffrey’s player prop bets for Sunday’s game, which starts at 4:05 PM ET on FOX. McCaffrey and the San