BALTIMORE - Ravens defensive tackle Haloti Ngata got the day off Sunday, given an opportunity to rest the sprained right knee and injured right shoulder that have plagued him for the past several weeks.
Ngata dressed for the game, but he didn't play.
Rookie DeAngelo Tyson started in Ngata's place.
Ngata missed practice Wednesday and Thursday before participating on a limited basis Friday.
He had just two tackles in the Ravens' previous two games.
"We are trying to get Haloti healthy," Harbaugh said. "He didn't practice this week much, but we felt like it would be smart to dress him because he is a difference maker for us."
"We started the game out and we were hoping that we wouldn't have to play him, and it turned out that we didn't have to play him, so we decided to rest him in this game."
Tyson finished without a tackle, but he had two pass deflections and a quarterback hurry.
SMITH UNABLE TO GO: Harbaugh voiced uncertainty regarding the status of cornerback Jimmy Smith.
Smith (groin/abs) experienced tightness during pregame warmups and never entered the game Sunday despite being active.
Smith was hurt during the Baltimore's win against the Dallas Cowboys in Week 6, but he was yet to miss any time prior to Sunday.
"We're going to have to take a hard look at that Monday and just see where he's at," Harbaugh said. "This is the first time it has gotten to the point where he just couldn't get loose enough to play."
Corey Graham started in Smith's place while second-year player Chykie Brown saw extensive time in the Ravens' sub-packages.
Graham and Brown each surrendered a touchdown pass - Graham a 30-yarder to Denarius Moore and Brown on a 55-yard catch-and-run by Darrius Heyward-Bey.
REID STEPS IN: With left guard Bobbie Williams nursing a sprained left ankle, Baltimore decided to rest Williams and get a more extensive look at second-year player Jah Reid.
Left guard has been a problem area for the Ravens this season.
Williams has started each of the last four games after replacing Ramon Harewood in the starting lineup, but he has limited mobility and has struggled in pass protection.
Reid replaced Williams during Baltimore's third offensive series and played the rest of the game from there.
Reid was in for nine snaps during last week's win against the Cleveland Browns, the first game he was active for this season after battling a lingering calf injury for much of the previous four and a half months.
Reid was the Ravens' third round pick in last year's NFL draft.
"Bobbie has had the ankle, so it was a chance for us to rest him, and Jah Reid has really been coming on and practicing well," Harbaugh said, "What Jah needs is playing time. He needs experience, he needs snaps on the field, so it was our plan to start him out there in the third series no matter what and play him as much as we could.
"It was good to have that opportunity, and he played well."
RECORD DAY FOR JONES: With his 105-yard kick return for a touchdown during the fourth quarter, Jacoby Jones became the first player in NFL history with two kick returns of at least 105 yards.
He's also the first player in Ravens history to post multiple kick returns for touchdowns in a single season.
Jones had a 108-yard kick return for a score against the Cowboys in Week 6.
RED HOT: Baltimore's defense has held opponents without a touchdown on eight consecutive trips inside the Ravens' red zone.
The Raiders were 0-for-3 inside Baltimore's red zone Sunday.
For the year, the Ravens have limited opponents to just 13 touchdowns on 36 trips inside Baltimore's red zone.
HOME DOMINANCE: The Ravens have now won 20 of their last 21 home games, including 15 in a row.
The 15 consecutive wins at home represents the longest active streak in the NFL.
Baltimore's last home loss was a 13-10 defeat to the Pittsburgh Steelers Dec. 5, 2010.