The 49ers had to piece things together on the fly against Denver, and the back end held. San Francisco came away with a 24-14 win in Week 4 to move to 4-0, and the story of the afternoon was a defense that absorbed injuries, shuffled bodies and still found enough answers to keep the Broncos under control.
Malik Mustapha was the standout when Pro Football Focus handed out the grades. The free safety logged 21 defensive snaps and came away with an 81.5 overall mark, the best on the team. His work in coverage was especially sharp: a team-high 73.7 grade across 15 coverage snaps, no receptions allowed and a pass breakup to his name.
Ji'Ayir Brown also did his part as the steadying force in the deep middle. Over 66 snaps, he posted a 69.9 overall grade and a 70.1 coverage grade while allowing just two catches for eight yards. Rookie cornerback Renardo Green added a solid 65.4 grade on 67 snaps, and linebacker Dre Greenlaw finished with a 68.3 overall mark in 58 snaps against his former team.
The top five also included defensive tackle Sebastian Valdez, who made the most of limited work. He earned a 68.7 grade on 25 snaps, giving San Francisco another useful piece in a game where depth mattered more than ever.
Not everyone came through cleanly. Cornerback Upton Stout had the roughest grade on the defense at 38.8 over 37 snaps before leaving with a shoulder injury.
Denver attacked him eight times, and he gave up eight completions for 80 yards, which showed up in a 35.5 coverage grade. Defensive tackle Naquan Jones checked in at 42.6, defensive end Keion White at 48.1, linebacker Jaden Dugger at 49.4 and defensive tackle Gracen Halton at 49.8.
San Francisco still managed to affect Bo Nix without finishing with a sack. The defense produced 16 total pressures from seven different players.
Osa Odighizuwa posted the best pass-rush grade on the team at 75.5 and finished with two pressures and two tackles. Greenlaw led the way with four pressures, White added three, and Romello Height, Ogbo Okoronkwo and Valdez each contributed two.
Mustapha also got home once on a blitz. Matthew Judon, meanwhile, had a quiet day with a 50.1 pass-rush grade and no pressures on 15 snaps.
The run defense had its own bright spots. Marques Sigle earned a team-best 73.6 run-defense grade and also posted the top tackling mark on the team at 84.6 after making six tackles without a miss. Odighizuwa, on the other hand, received the lowest run-defense grade of the game at 31.8.
Fred Warner had one of those rare games where the numbers didn’t look like his usual standard. The All-Pro linebacker finished with a 57.4 overall grade, a 52.5 coverage mark and a 35.1 tackling grade after being charged with two missed tackles.
Even with the injuries and the uneven individual performances, Raheem Morris’ defense kept its footing. The unit didn’t break when the game started to tilt toward attrition, and that was enough to leave Denver stuck at 14 points and San Francisco still unbeaten.
In Other News...
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Purdys strong start to the 2026 season has him sitting among the leading MVP candidates, which is a remarkable place for a player who once entered the league with almost no draft-day fanfare. The more he stacks clean, composed performances, the more he seems to become a benchmark rather than a question, a standard other quarterbacks are measured against instead of the other way around. [Read more 🡒]