SANTA CLARA, Calif. (AP) - Jim Harbaugh has watched each of his two quarterbacks lead the San Francisco 49ers to big wins in hostile, road environments - Alex Smith in the season opener at Green Bay's Lambeau Field back in September, and Colin Kaepernick on Sunday at the New Orleans Superdome.

Which one gets the ball on Sunday at St. Louis? Harbaugh is still mum on that, though he did say Monday he will formally announce his starting quarterback by mid-week so the players don't have to face constant questions about what they know about the situation.

The NFC West-leading Niners (8-2-1) now own the second-best record in the NFC behind Atlanta as they head to face the Rams in a game that will mean plenty for both teams after their 24-24 tie Nov. 11.

---

Online: http://pro32.ap.org/poll and http://twitter.com/AP-NFL