Every Vikings player bears the scar of last year's season-ending 3-8 skid, even though Mike Zimmer is quick to defend his prideful defense that started the year better than any team in the NFL.

"We had two bad games," Zimmer said of the defense. "I don't know about tapered off. We finished third in the league in points scored and every other statistical category."

In Zimmer's third season at the helm, the Vikings defense recorded top-10 finishes in five major categories: yards allowed (third), passing yards allowed (third), sacks forced (fifth), points allowed (sixth) and takeaways (seventh).

The NFL took notice when they were the league's last unbeaten team at 5-0.

"Our team was clicking," defensive end Brian Robison said. "Offense was putting up points. Defensively we were making plays."

But by October, comparisons to all-time vaunted defenses stopped.

Carrying the weight of an offense that failed to reach 21 points in seven of nine games, the Vikings defense, the team's backbone, started to break.

Perfectly mediocre made a sour replacement for all-time great. That's 8-8 for you.

Zimmer knows his defense, which featured five Pro Bowl players last season, is better than the record suggested. That's why the Vikings extended the contracts of three cornerstones — cornerback Xavier Rhodes, defensive end Everson Griffen and defensive tackle Linval Joseph — this summer.

But Zimmer still tinkered with the unit that brought the Vikings back to relevancy. He made at least three lineup changes. The veteran defensive coach even considered giving up play-calling to better manage game days but quickly took back the play sheet this preseason.

He and his coaches are also encouraging Vikings defenders to generate a little recklessness within their well-oiled, tightly wound machine in the hope of interrupting offenses more at and behind the line of scrimmage.

"Don't be satisfied with just, 'Hey, I did my job,' " said linebackers coach Adam Zimmer. "Let's get more hats on the ball."

Bending until they broke?

The Vikings spent more time near the goal lines of the Winter Park practice fields this summer. A 2-4 record in one-score games last season led Zimmer to install more drills focused on hurry-up and red-zone situations in practices.

"They were critical situations for us that we want to get better at this year," Robison said.

Not many NFL defenses were put in more "critical situations" last year than the Vikings. Perhaps that led to the worst two-game stretch of Zimmer's Vikings tenure, surprisingly at the end of his defense's best statistical season in Minnesota. In those consecutive embarrassing December losses to the Colts and Packers, the Vikings allowed 27 points by halftime for just the second and third times in the Zimmer era.

Leading up to those games, the Vikings went 2-4. The four backbreaking losses were by an average of four points.

In that six-week stretch before the Colts game, only two NFL defenses were forced into more high-stress snaps (leading or trailing by four points or fewer in the second half) than the Vikings, according to ESPN Stats and Information.

"Really it was the first half in Green Bay, because we played better in the second half," Adam Zimmer said. "The Indy game, they schemed us on some things and we didn't play our best. We can't have those games, obviously."

Were the Vikings tired? Perhaps not so much physically. Minnesota's sputtering offense actually averaged the fifth-longest average drive time, per Football Outsiders. But mentally, Vikings defenders entered games burdened by a close score more often than not.

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"We can say a lot of things about having so many injuries early in the season and things like that," Robison said. "But we still had opportunities to win games and still weren't able to make the plays we needed to make."

The Vikings prioritize two skill sets for defenders — the ability to rush the passer and cover the pass. That's why in 2015 and 2016 they made early draft picks of defensive end Danielle Hunter and cornerback Mackensie Alexander, both expected to be first-year starters this season. Rookie weakside linebacker Ben Gedeon, a fourth-round pick, will start, too.

But to regain full speed, the Vikings need more from last year's 20th-ranked run defense. Pinning offenses in second-and-long and third-and-long spots is how they can maximize their stable of pass rushers and cover defenders.

In the 3-8 stretch last year, the Vikings allowed seven offenses to top 100 rushing yards. That's compared to just one 100-yard rushing game in the 5-0 start. A 4- or 5-yard run on first down prevents Vikings ends from attacking the quarterback untethered on the next play.

"It becomes a guessing game," Robison said, "if we're allowing them to have shorter sticks and better opportunities of moving the chains."

Preseason results might be a good sign. Vikings starters allowed just 34 rushing yards on 14 carries against the Seahawks and 49ers.

That has to carry over into the regular season. The defensive system is proven to work, and the Vikings are just two years removed from the NFC North title. Still, the franchise hasn't had a playoff win since Brett Favre was under center.

After this particular offseason discussing failure, Vikings defenders are eager for something new to talk about other than being crushed by Aaron Rodgers or Andrew Luck.

"These guys have an awful lot of pride," Mike Zimmer said.

"They're good competitors, and actually they're a lot of fun to be around. Every year is different, so we'll find out when we go play. But I have a lot of confidence in their ability."

KEYS TO VICTORY

On defense, areas ripe for improvement

You don't need to look around long in the Vikings defense to find three critical points that will help decide the success or failure of the 2017 season. It is not so much about newcomers as it is the ongoing development of a couple of the Vikings' young defensive stars. All within the front seven, you'll find the enigmatic and talented linebacker Anthony Barr, the unlikely ascension of defensive end Danielle Hunter, and a defensive tackle position chock full of question marks as the Vikings still try to fill a void created by the continued loss of injured first-round pick Sharrif Floyd. To maintain the defensive standard set by head coach Mike Zimmer in Minnesota — including last year's top-five finishes in yards per play, yards per game, passing yards per game and quarterback rating against — the Vikings will need big contributions from these three areas. Anthony Barr linebacker

Where did Anthony Barr go in 2016

That's a question many people asked after Barr, the former ninth-overall pick, started for a top-five defense, yet saw his numbers dip in almost every major category. He didn't go anywhere, according to linebackers coach Adam Zimmer, but there are areas he wants to see the young linebacker improve.

"Anthony got a bad rap last year. He really did not have a bad year," said Zimmer, the son of Vikings head coach Mike Zimmer. "Pro Football Focus says he couldn't cover. I've got a lot of plays that say the opposite."

Mike Zimmer noted Barr's "tendency to coast" last season. The challenge for the Vikings and for Barr, then, is to get consistent effort and maximize the potential packed in his 6-foot-5, 255-pound frame.

"It's the grind of the season, sometimes that happens," Adam Zimmer said. "Anthony is working on constant effort to the ball."

The Vikings have had Barr working with defensive line coach Andre Patterson to add pass-rush moves. Barr went from PFF's most proficient 4-3 blitzing linebacker in 2015 to middle of the pack last season.

"I think he can improve his pass rush," Adam Zimmer said. "He's worked on that. Hopefully we get him in there making a lot more plays."

Defensive tackle

Vikings may turn to committee at DT

A hole the size of a first-round pick remains next to nose tackle Linval Joseph.

The Vikings again this season will be without defensive tackle Sharrif Floyd, who continues to recover from nerve damage affecting muscles in his leg. So they've turned to a handful of players to fill the void, led by 33-year-old defensive tackle Tom Johnson who could cede rotational snaps to a newcomer in rookie Jaleel Johnson.

"They've been saying I was old since 29," Tom Johnson said. "I've had to prove myself over and over and over and over again."

Johnson held onto the starting job throughout practices this summer, but head coach Mike Zimmer likes to rotate his defensive linemen. The Vikings invested a fourth-round pick in Jaleel Johnson, the Iowa product who churned out 7.5 sacks last fall and put together a strong preseason for the Vikings.

Johnson was originally put at nose tackle, but a move to Floyd's former spot at defensive tackle helped him stand out this summer.

"He can use his bulldog mentality a little bit more, I think," Zimmer said.

The Vikings will look to a combination of the two Johnson's, and potentially fourth-year nose tackle Shamar Stephen in run-stopping situations, to continue to fill the void left by Floyd, who has yet to return to practice a year after complications from surgery first threatened his NFL career.

Danielle Hunter Defensive End

Hunter ascends into starting lineup

Danielle Hunter is 22 years old with one career start.

Yet the Vikings defensive end is being recognized as one of the best young defenders in the league. Why? Just ask the guy whose job he's taken.

"Well, he does things that are different than your typical [young player]," defensive end Brian Robison said. "You always see him taking notes and he's always asking questions, whether it be something like a formation, technique or anything like that."

A curious mind, and Hunter's 6-foot-5 build with 34 ¼-inch arms, have made him a terror only approaching his peak entering a third NFL season. Hunter's 12.5 sacks ranked third in the league last season despite playing a part-time role.

Now he's been promoted to the starting lineup, where the Vikings look for Hunter to continue his ascension as a versatile defender capable of rushing left or right tackle. He's been moved around the defensive line this summer, even dropping back into coverage at times when the Vikings get creative with zone blitzes.

But where the Vikings could see the biggest boost from Hunter is against the run, where he's learned to use his uniquely long arms to his advantage against less athletic offensive linemen. After a strong start to his career, Hunter is receiving top-10 odds for NFL Defensive Player of the Year from at least one prominent Las Vegas sportsbook.

"He's got all the physical tools you'd want in a defensive end," Robison said. "I think the future is bright for him."

Andrew Krammer

confidence on defense

Mike Zimmer's defense gives the Vikings their identity, but a few questions must be answered before knowing whether this unit can become a top-3 defense. Here is my confidence reading for every position group on defense rated from 0 (no confidence) to 5 (supreme confidence).

Defensive line: 5.
Easily the team's strongest position. Everson Griffen, Linval Joseph and Danielle Hunter present nightmare match-ups for offensive lines.

Linebacker: 3½.
The prediction here is that Anthony Barr bounces back from subpar season and returns to form. Eric Kendricks has solidified himself as a playmaker in the middle.

Safety: 3.
Harrison Smith ranks among the best in the NFL but depth could be an issue at this spot. Andrew Sendejo kept his starting spot, but who fills in if one of those two are not available?

Cornerback: 3-1/2.
Xavier Rhodes established himself as a star and was rewarded with a big contract. Trae Waynes needs to take another step in his development. Pressure is on Mackensie Alexander to justify team's faith in not re-signing slot-nickel Captain Munnerlyn.

Chip Scoggins

Super Bowl bound?

The many core star players all stay healthy, match Pro Bowl talent with All-Pro production and dominate while the new faces and role players step in and provide enough stability and depth to keep this unit fresh for all 16 games.

Mark Craig