The 49ers Ray McDonald (91) and Justin Smith (94) sack St. Louis Rams quarterback Kellen Clemens (10) during the first quarter of their game at Candlestick
The 49ers Ray McDonald (91) and Justin Smith (94) sack St. Louis Rams quarterback Kellen Clemens (10) during the first quarter of their game at Candlestick Park on Sunday, Dec. 1, 2013, in San Francisco, Calif. The 49ers defeated the Rams 23-13. (Aric Crabb/Bay Area News Group)