Tyler Lockett and Frank Clark, who provided a good early return on Seattle’s draft class of 2015 — literally in Lockett’s case. His 103-yard kickoff return in the first half provided the only Seattle touchdown for most of the game.

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The good from Seattle’s exhibition season opening 22-20 loss to Denver?

Rookies Tyler Lockett and Frank Clark, who provided a good early return on Seattle’s draft class of 2015 — literally in the case of Lockett. His 103-yard dash with a kickoff in the second quarter gave quick evidence that he should prove as able to revive Seattle’s return game this season as the team has said.

“That’s a beautiful first message they sent us that they are ready to do something to help this football team,’’ said coach Pete Carroll of Lockett and Clark, the latter of whom disrupted the Denver offense throughout.

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Seahawks @ Kansas City Chiefs (exhibition), 5 p.m., Ch. 13

The bad? Among several leading candidates, start with a shaky offensive line that was harassed all night long by the Broncos.

“It’s disappointing that we struggled up front but not surprising that the young guys might have some trouble,’’ Carroll said. “We just need to get a lot better and get a lot better fast with all the backup guys.’’

The ugly?

Injuries to receiver Chris Matthews and quarterback Tarvaris Jackson, though Carroll indicated each may not be as severe as they first appeared.

Matthews suffered an AC sprain of his left shoulder while trying to recover a fumbled punt and may be out two weeks or so, Carroll said.

Jackson suffered an ankle sprain in the third quarter that Carroll also said might keep him sidelined only two weeks or so.

The mitigating factor? The Seahawks played with a patchwork secondary that didn’t include a single founding member of the Legion of Boom, and also gave all of its starters just two series of work.

And the coaches will also surely find some other pockets of positives, such as second-year defensive end Cassius Marsh, who was active throughout, and the play of some of the other backups on the defensive front.

Still, the manner in which the offensive line struggled throughout, and the fact that some of the depth players on defense who got taken advantage of at times could have to play this season, left more than enough room for concern for the Seahawks as they lost their exhibition opener to the Broncos for the second straight year.

Key performers

WR Tyler Lockett: Averaged 46 yards on four kickoff returns, including a 103-yard TD.

DE Frank Clark: Had nine tackles and forced a fumble.

QB Russell Wilson: Completed his only pass attempt for 12 yards to TE Jimmy Graham.

“Pretty sloppy first game for us in a number of ways, and not as good as we like coming out of these first two weeks,’’ Carroll said.

Other than Lockett’s return, the Broncos dominated the first half, with their defensive line feasting on Seattle’s offensive line,

Key performers

WR Tyler Lockette: Averaged 46 yards on four kickoff returns, including 103-yard TD.

DE Frank Clark: Had nine tackles and forced a fumble.

QB Russell Wilson: Completed his only pass attempt for 12 yards to TE Jimmy Graham.

The tone was set on the second play of the game when Denver’s Shaquil Barrett raced around Seattle offensive tackle Justin Britt to sack Russell Wilson and force a fumble that led to a Broncos field goal.

“They played a real basic game and it shouldn’t have been difficult for us,’’ Carroll said.

Carroll was also disappointed in the play of the second-team defensive front, saying “interior wise, we weren’t very good.They ran the ball very well against our second groups.’’

Indeed, Denver rushed for 67 yards in the second quarter to just 1 for Seattle, outgaining the Seahawks 162-9 overall in that quarter.

Lockett provided about the only early highlight.

A 46-yard kickoff return on his second attempt led to a Steven Hauschka 33-yard field goal that tied the game.

The drive, though, ended when Wilson was sacked on third-and-nine, typifying the pass-protection issues the Seahawks had throughout.

After a third Denver field goal made it 9-3, Lockett — whom the Seahawks took in the third round of the 2015 draft after trading three picks to Washington to move up 26 spots — struck again.

Lockett took a kickoff 3 yards deep in the end zone and then burst left past the line and down the sideline to the other end zone.

“That’s 4.3 (speed),’’ Carroll said. “A lot of fast guys trying to get him, and he turned the corner.’’

The rest of the play wasn’t without drama, though, as field judge Eugene Hall threw a flag that initially confused most of those watching. The replay then made it clear why — Hall had collided with Carroll and penalized the Seahawks for sideline interference.

The TD stood and the penalty assessed on the kickoff, giving Seattle a 10-9 lead. It was the only time the Seahawks had the upper hand all game.

The rest of the first half was domination by Denver. Fourth-year backup QB Brock Osweiler — who started for Peyton Manning among several Denver starters who didn’t suit up — hit on 15 of 20 passes for 151 yards and a touchdown.

Seattle, meanwhile, could get nothing going offensively as Wilson and Jackson were a combined 2 of 5 for 20 yards passing in the first half while Seattle rushed for just 26 yards on 11 attempts.

One of the few highlights of the first half was the play of Clark, the team’s controversial first pick in the 2015 draft who forced a fumble on his first series and had three solo tackles overall. He later stopped a fourth-and-inches play in the second half.