HOUSTON, Texas – Marcus Mariota showed off his speed twice here on Sunday.

The Titans quarterback turned on the jets on his 34-yard touchdown run, and he sprinted to the pylon – and made it – on a two-yard touchdown later in the game.

Unfortunately, Mariota suffered a hamstring injury on his second score, and as a result he didn't finish the game. It was part of a bad day for the Titans, who lost 57-14 to the Texans.

"We'll do an MRI and we'll know more tomorrow," coach Mike Mularkey said of the injury.

Mariota returned to the game after the run, and actually came back on the field to start the second half. But after talking to coaches and trainers, he went back in and didn't return to the sideline until the fourth quarter.

Back-up quarterback Matt Cassel finished the game for the Titans.

"He wanted to see if he could play," Mularkey said of Mariota. "He came out, warmed up and I said to him: 'I'd like to be smart about it. There's a lot of football still to go. We have 12 games to go, so let's be smart about it. I'll know more about the extent of it (later)."

Mariota completed 6-of-10 passes for 96 yards in the first half, with a pair of interceptions. He carried the ball four times for 39 yards in the contest.

Mularkey said the second interception thrown by Mariota came partly because he couldn't step into the throw, after suffering the injury. It ended up being Mariota's final play of the game.

Cassel completed 4-of-10 passes for 21 yards in the second half, with two interceptions.

"I would have loved to go out there and started a comeback, but today obviously it didn't go well," Cassel said. "It was a bad day at the office. I have to play better obviously. I have been doing this for a long time and this was one of those things where things went downhill pretty quickly."

Mariota wasn't in the locker room after Sunday's game, and didn't talk to reporters as he met with trainers.

Teammates said they're hopeful he'll be back soon.

On the season, Mariota has completed 66-of-110 passes for 792 yards, with three touchdowns and three interceptions.

"I saw him, and just told him to keep his head up pretty much," tight end Delanie Walker said. "I know Marcus is a pretty tough person, and I am sure whatever it is he'll do his best to try and get back on the field as soon as possible."

The Titans face the Dolphins next Sunday.

"He is a fighter," receiver Rishard Matthews said of Mariota. "I'm sure that guy will be out there."