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49ers vs Jaguars | Week 4 NFL Predictions

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On Sunday, September 28, the San Francisco 49ers will host the Jacksonville Jaguars in a clash that promises strong emotions in Santa Clara. Both come with a winning record and the urgency to consolidate themselves as serious contenders. For the locals, the return of Brock Purdy may mark a before and after, while Jacksonville seeks to confirm that its good start is no coincidence.

San Francisco 49ers: Surviving the Injury Storm

San Francisco's season has not been easy. Despite a solid start, injuries have hit key pieces of the roster hard. George Kittle and Brandon Aiyuk are out, while Nick Bosa will miss the rest of the year after his hamstring injury. That has forced the team to reinvent itself on the fly.

Mac Jones delivered in Purdy's absence with four touchdown passes and just one interception, but he himself is in cotton wool. The expectation is that Purdy will return to command the offense, even if he is not yet 100%. With him under center, Kyle Shanahan's offense gains accuracy, mobility and confidence.

The defense, traditionally the hallmark of the franchise, will have to adjust without its star on the line. The challenge will be to contain the Jaguars ground game, which comes in great shape. If San Francisco can win the battle in the trenches, it will have a lot of ground to make up.

Jacksonville Jaguars: Balancing Offense And Defense

The Jaguars have found stability under Liam Coen. With a 2-1 record, they rely on an opportunistic defense that already has nine fumbles recovered and a ground attack that exceeds 140 yards per game. That combination has been enough to break through at the start of the schedule.

Trevor Lawrence, however, remains an unknown quantity. His numbers (671 yards, 4 TDs and 4 interceptions) reflect ups and downs in his performance. While he has talent in Dyami Brown, Brenton Strange and Brian Thomas Jr. he needs more consistency in his reads to avoid jeopardizing possessions.

Travis Etienne Jr. is the big offensive engine with 270 yards and a touchdown. His ability to generate consistent leads will be crucial against a 49ers defense that has lost solidity up front. If he can establish the ground game, Jacksonville can control the clock and wear down their opponent.

Statistical Comparison

The numbers help to understand the contrast between the two teams: San Francisco battered by injuries, but with the advantage of playing at home; Jacksonville with a more balanced game but still inconsistent at quarterback.

Statistics (2025) 49ers Jaguars
Record 2-0 2-1
Points in favor (average) 21.5 23.3
Points against (average) 18.0 17.0
Starting QB Brock Purdy Trevor Lawrence
Yards per land 112.0 141.7

*Purdy questionable due to injury, with options to return in this game.
Both teams show defensive solidity on the scoreboard, but Jacksonville has more ground tools, while San Francisco will depend on what Purdy can provide.

Keys to the Match

The details will make the difference, and the margin of error is minimal for two teams that look like playoff contenders.

Purdy's return: if the starting quarterback plays, the 49ers gain offensive creativity.

Jacksonville's ground game: Travis Etienne Jr. can make a difference if he finds holes.

San Francisco's decimated defense: without Bosa, the pass rush loses power and Lawrence could have more time to throw.

Final Forecast

Levi's Stadium tends to weigh, and Purdy's return could give the 49ers the boost they need. Jacksonville is competitive and has offensive weapons, but its quarterback still doesn't have the same confidence as Mahomes or Burrow at key moments.

Prediction: San Francisco 49ers win in a close game, with defense adjusting well enough and Purdy making the difference. Estimated score: 49ers 20 - Jaguars 14.

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