Marcus Mariota out again, Zach Mettenberger to start Sunday

Titans quarterback Marcus Mariota will miss his second straight game on Sunday. Zach Mettenberger will start on Sunday against the Texans and Mariota will sit out, coach Ken Whisenhunt confirmed today. The Titans entered today’s practice optimistic about Mariota, who suffered a knee injury two weeks ago against the Dolphins. But Mariota is not yet…