Rookie Smith's hit on Stafford costs $15,000

San Francisco 49ers rookie Aldon Smith made Matthew Stafford pay with a big hit Sunday.

The NFL made Smith pay, too,

Smith, who has 5.5 sacks over the 49ers' past three games, drew a $15,000 fine from the NFL for hitting the Detroit Lions' quarterback below the knee area as Stafford threw incomplete. The play drew a 15-yard penalty for roughing the passer.

The league also fined the Lions' Brandon Pettigrew for a chop block. That fine was for $7,500.