In the biggest game of the year so far, the 49ers’ defense, stacked with young players in every area, produced its best performance of the season as San Francisco improved to 5-0.
A unit that has been so often maligned in recent seasons and in which the 49ers have invested considerable draft capital has shown clear signs of promise under new coordinator Raheem Morris.
But the level of dominance the defense displayed as the 49ers edged the Seattle Seahawks 32-29 in a thriller was far from expected.
Despite the number of points allowed, the numbers around the Niners’ defensive display make for impressive reading.
San Francisco created four turnovers, continually giving the offense short fields with which to work in the first half, sacked Seattle quarterback Sam Darnold five times and registered eight QB hits, and held the Seahawks to just 3.4 yards per rush on the ground.
Held to field goals on five of its seven trips into San Francisco territory, Seattle had a success rate of just 30 percent on offense, with that number in large part a product of the joy the 49ers had up front.
Indeed, per Sumer Sports, the 49ers registered a 51.4% pressure rate with seven different players recording at least two pressures.
Darnold was sacked by five different players, with Jaden Dugger, Keion White, Gracen Halton, Sebastian Valdez and Osa Odighizuwa all getting in on the act.
While White and Odighizuwa have plenty of experience, the three other players in that quintet are each just starting their careers. Defensive tackle Valdez has worked his way onto the 53-man roster after spending his rookie year and starting this year on the practice squad. Versatile linebacker Dugger and defensive tackle Halton are each part of a 2026 rookie class that is looking increasingly promising.
Halton made one of the most significant plays of the day, forcing and recovering a fumble from Seahawks running back George Holani in the final seconds of the first half to score a touchdown that put the 49ers up 21-13.
Dugger, meanwhile, was thrust into more extensive action than planned, moving from playing strong side linebacker on base downs to playing all three downs as the weakside backer following Dre Greenlaw’s second-quarter ejection.
In addition to his sack on which the screamed around the edge to bring down Darnold, Dugger also had nine tackles, a tackle for loss and a quarterback hit, his performance part of a wider superb effort from a back seven that continues to make significant strides, Renardo Green the standout in the secondary as the third-year corner took his excellent start to the season to new heights with two interceptions.
Led by the crucial veteran voice of middle linebacker Fred Warner, the 49ers — boosted by the return of last year’s first-round pick Mykel Williams at defensive end — dictated the line of scrimmage against both the run and the pass, while the secondary continued its ascension, albeit against a Seahawks offense lacking true difference-makers at the pass-catching positions outside of Jaxon Smith-Njigba.
And the significance of the all-round performance of his young defense was not lost on head coach Kyle Shanahan.
Shanahan told his postgame press conference:
“From what I saw watching, it looked like they stepped it up a number of times. Just the guys you mentioned, I saw them make a number of plays today. If that doesn’t happen, especially when you lose a guy like Dre, and Dugger starting at base, but having to play that much at nickel with Dre going out. Gracen with losing some of the D-linemen we’ve had. Mykel with his first game back. It’s really hard to win a game in that situation if those guys don’t step it up, and they’ve been stepping up huge.”
The extent to which the inexperienced members of the defense stepped it up, in a game of such magnitude and — for the most part — without a key player at the second level was stunning.
But it was not a surprise to the players on the defense.
“When you’re out there it’s your time to play,” Green said when asked about the contributions from the young players.
“When you’re out there – I don’t care who’s out there – you’re the guy. So it doesn’t matter if you’re an old guy or a young guy, we all are held to the same standard. That’s how the players hold accountability for each other, and that’s how our coaches also push us.
“So, it doesn’t surprise me that young guys are making plays, we do it all the time in practice. We were doing it in camp, and we were doing it in preseason. No matter who’s out there, we’re all held accountable and to the same standard.”
Outside of Warner and Greenlaw and with star edge rusher Nick Bosa still, for now, on the sidelines, the 49er defense is lacking in household names.
But, as White articulated, there is no shortage of self-belief.
“We got the utmost confidence. (Defense) has been going crazy,” White said.
“Seabass [Sebastian Valdez], he’s been really stepping up big, making the most of his moment. Yeah, Dugg [Dugger] is a great player in this league. Shout out to John [Lynch] for drafting the really good young guys. And shout out to them for stepping up.”
That confidence is reflected by the high-intensity way in which the defense plays the game, which is a crucial reason why 49ers left tackle Trent Williams thinks so highly of the youthful group Morris has at his disposal.
“We have a really young defense, but these guys fly around,” explained Williams. We got a young nucleus, a few young players on that side led by Fred. That defense is a sneaky good defense. To keep holding that offense to three [points], that’s what gave us a chance to win.”
Asked about the strong performance of the defensive line without Bosa, Williams added: “I can’t say that I saw it coming, but you’ve seen [rookie edge rusher Romello Height], you see him coming on, you see how many plays and how close he is to affecting the game every week.
“That line is not a lot of household names so to speak outside of Bosa, but the way they play, they play like their hair is on fire. That’s a very special group.”
After the defensive performance in Seattle, more around the NFL are likely to agree with Williams’ assessment. And, with Bosa seemingly set to return in Week 6, a defense few would have necessarily feared coming into the season is set to become an even scarier proposition for opposing offenses.
