**
SANTA CLARA, Calif. –** The Titans trail the 49ers 16-10 at halftime here at Levi's Stadium. A look at what's happened so far:
Titans quarterback Marcus Mariota completed 9-of-13 passes for 99 yards and a touchdown, with a 117.3 rating, in the first half.
The 49ers took a 3-0 lead on a 38-yard field goal by kicker Robbie Gould, which capped a 12-play, 64-yard drive. Titans linebacker Avery Williamson's sack of quarterback Jimmy Garoppolo backed the 49ers up, and helped the team get a stop.
The 49ers made it 6-0 on Gould's second kick of the game, this one from 48 yards.
After the Titans cut the lead to 6-3 on a 40-yard field goal by kicker Ryan Succop, the 49ers answered back with a long drive of their own.
Garoppolo's five-yard touchdown pass to tight end Garrett Celek capped a 17-play, 85-yard drive that took 8:36 off the clock, and made the score 13-3. Gould's third field goal of the half made it 16-3 with 1:37 left before halftime.
The Titans cut the lead to 16-10 just before halftime on a four-yard touchdown pass from Mariota to tight end Delanie Walker, which capped a 6-play, 79-yard drive. Mariota completed 5-of-6 passes on the drive, including the scoring strike to Walker with just 29 seconds left before halftime.
Until then it was a tough half for Walker, who let a catchable ball go off his hands in the end zone, and later lost a fumble.
The Titans get the ball to start the second half.
The Tennessee Titans prepare to take on the San Francisco 49ers in Week 15 action at Levi's Stadium in Santa Clara, Calif.(Photos: Donn Jones, AP)