The 5 toughest quarterbacks the San Francisco 49ers face in 2017

SANTA CLARA, CA - OCTOBER 02: Dak Prescott #4 of the Dallas Cowboys changes a play at the line of scrimmage during the second quarter against the San Francisco 49ers at Levi's Stadium on October 2, 2016 in Santa Clara, California. (Photo by Ezra Shaw/Getty Images)
SANTA CLARA, CA - OCTOBER 02: Dak Prescott #4 of the Dallas Cowboys changes a play at the line of scrimmage during the second quarter against the San Francisco 49ers at Levi's Stadium on October 2, 2016 in Santa Clara, California. (Photo by Ezra Shaw/Getty Images) /
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KANSAS CITY, MO – DECEMBER 18: Quarterback Marcus Mariota #8 of the Tennessee Titans motions during the game against the Kansas City Chiefs at Arrowhead Stadium on December 18, 2016 in Kansas City, Missouri. (Photo by Jamie Squire/Getty Images)
KANSAS CITY, MO – DECEMBER 18: Quarterback Marcus Mariota #8 of the Tennessee Titans motions during the game against the Kansas City Chiefs at Arrowhead Stadium on December 18, 2016 in Kansas City, Missouri. (Photo by Jamie Squire/Getty Images) /

No. 3: Marcus Mariota, Tennessee Titans

This might sound “homeristic” — no, that’s not a word, but who cares? — but people should get on board the Marcus Mariota hype train.

The Tennessee Titans’ third-year quarterback is poised to have a true breakout year in 2017. His team could easily be one of the sleeper picks to steal away the AFC South this season. They’re that improved.

A year ago, Mariota completed 61.2 percent of his passes with an impressive 26-to-9 touchdown-to-interception ratio before a season-ending leg injury at the tail end of 2016.

And that was without a true No. 1 wide receiver.

So what did Tennessee do? Well, drafting former Western Michigan wideout Corey Davis — widely viewed as the top prospect at his position — at No. 5 overall this year was smart. Adding fellow receiver Eric Decker in free agency helps matters too.

Yeah, Mariota should have a big year. And he could have a big game in Week 15 against the 49ers.

Why It’s Difficult for the 49ers

Mariota has never faced the 49ers, so splits don’t mean a thing here.

What does matter, however, is how San Francisco will defend against him. Big-play receivers are something the Niners may have trouble with in 2017 (more on that later), so Davis and Decker should make San Francisco a bit uncomfortable.

Mariota only took 23 sacks last year — tied for 24th most in the NFL — which is a nice testament to his elusiveness and ability to avoid pressure.

If San Francisco’s pass rush can’t get home, Mariota will be a problem.