NASHVILLE, Tenn. — The Tennessee Titans finally have a victory in a game where quarterback Marcus Mariota left injured, and Blaine Gabbert did much more than just win.

Gabbert kept the Titans' playoff hopes alive.

The veteran threw a 2-yard touchdown pass to MyCole Pruitt with 4:30 left and the Titans rallied to beat the Washington Redskins 25-16 on Saturday for their fourth straight victory.

“I don't know,” Gabbert said when asked if this was the biggest win of his eight-year career with four teams. “It was a fun win. We got a big game next week.”

The victory was Tennessee's first in the seven career games that Mariota has left with an injury.

Coming off the bench for the third time this season, Gabbert threw for 101 yards after the Redskins knocked Mariota out of the game late in the first half with a stinger. Gabbert hit Taywan Taylor for 35 yards to jump-start the winning drive, Derrick Henry ran four times for 33 yards, his last an 18-yarder to the 2. Gabbert then hit Pruitt at the back of the end zone.

The Titans (9-6) must beat Andrew Luck and the Indianapolis Colts and have either Baltimore or Pittsburgh lose once to earn the AFC's second wild-card spot for a second consecutive playoff berth.

“The only scenario that any of us are smart enough to worry about is us preparing to win and ultimately win, and that's all we can do right now,” first-year Titans coach Mike Vrabel said.

Safety Kevin Byard intercepted Josh Johnson's pass on third-and-3 with 1:17 left. Then Malcolm Butler picked off a pass as time expired and ran 56 yards for an emphatic TD.

The Redskins (7-8) have lost five of six, and coach Jay Gruden said they couldn't ask for anything more from quarterback Josh Johnson, who came off his couch only weeks ago. Washington needs losses by Minnesota and Seattle to avoid being eliminated.

“I'm just very proud and sick for the way it ended for him tonight because he really just played (great), displayed great courage, leadership all in three weeks,” Gruden said. “I hate for him to be judged on that one pass (Byard's interception), but overall just very, very proud of the way he came in here and led this team.”

Mariota had thrown for 110 yards when sacked with 48 seconds left in the first half by defensive end Jonathan Allen. His right, throwing shoulder and arm were examined, then he walked to the locker room and was replaced by Gabbert.

The stinger is the same injury that knocked him out of Tennessee's loss Nov. 18 at Indianapolis.