49ers vs Dolphins Week 2 Preview: Purdy's Efficiency Meets Miami's Protection Problems

by Earl·September 20, 2026

The 49ers opened their season with a statement win over the Rams in Melbourne, while the Dolphins dropped their opener in Las Vegas. The betting market has installed San Francisco as a 13.5-point home favorite with a total of 45.5. But the numbers suggest this spread might be a tad too high.

San Francisco's Offensive Machine vs Miami's Reeling Defense

San Francisco put up 27 points and 379 yards in Week 1, showing perfect balance: 205 passing, 174 rushing. Brock Purdy was surgical, completing 73.5% of his passes for 205 yards, 3 touchdowns, and 1 interception (105.6 rating). The backfield duo of Christian McCaffrey (68 yards, 6.8 YPC) and Kaelon Black (65 yards, 4.6 YPC) gives the 49ers a two-headed monster. Deebo Samuel looked explosive again, scoring a fourth-quarter touchdown and re-establishing himself as a major weapon.

Miami's defense allowed 27 points to the Raiders and will now face a far more potent attack. The Dolphins did pick off two passes in Week 1, so they can create turnovers, but sustaining that against Purdy—who threw just one pick—is a tall order. The 49ers' 174 rushing yards per game could be a problem for a Miami front that struggled to contain Vegas.

Miami's Offensive Woes with Malik Willis

The Dolphins managed just 13 points and 294 total yards in Week 1, with only 74 rushing yards. Malik Willis completed 55.6% of his passes for 220 yards, no touchdowns, and one interception (66.9 rating). He was sacked five times, a glaring issue against a 49ers defense that held the Rams to 7 points and reigning MVP Matthew Stafford to just 155 passing yards.

Willis did show some rushing ability (39 yards, 1 TD), but he'll need to be much more efficient through the air to keep Miami competitive. De'Von Achane is a dual-threat back (36 rush yards, 30 recv yards), but he averaged just 3.3 yards per carry behind a shaky offensive line. The 49ers didn't record a sack in Week 1, but they'll likely generate pressure against a Miami front that surrendered five sacks.

Key Matchups

Quarterback: Purdy (105.6 rating) vs. Willis (66.9 rating) is a massive mismatch. Purdy protects the ball and spreads it around; Willis is still learning.
49ers Rush Offense vs. Miami Run Defense: San Francisco averaged 174 rushing yards in Week 1. Miami's defense gave up 27 points and will be without key linebackers (more on that below).
Miami's O-Line vs. 49ers Front: The Dolphins allowed 5 sacks in Week 1. If that continues, Willis won't have time to find Achane or his receivers.
Turnovers: Both teams had a +1 turnover differential in Week 1. Miami's defense had two interceptions, so they can flip the field. But Willis threw one pick and will face a ball-hawking secondary.

Model's Pick: Tight Spread, Low Confidence

Our model predicts a final score of 49ers 30, Dolphins 17. That's a 13-point margin, just under the 13.5-point spread. So the model likes Miami +13.5 to cover, though the confidence is only 0.5245—essentially a coin flip. The moneyline pick is San Francisco, but at -950, there's no value there.

The total is set at 45.5, and the model's predicted total is 47, suggesting a slight lean to the over. But with both teams capable of running the ball and the 49ers likely to control the clock, it's not a strong play.

Betting Angles

The line has been static since opening: 49ers -13.5, total 45.5. The public will likely hammer San Francisco after their impressive Week 1 win, but there are reasons to consider Miami.

Historically, the Dolphins have won 3 of the last 4 meetings, including a 43-17 blowout at Levi's Stadium in 2020. That's a strong trend, though rosters have changed significantly. Miami is also playing its second straight road game, but they're used to traveling. San Francisco, meanwhile, had to travel back from Australia, though they get an extra three days of rest (10 days vs. 7). That could favor the 49ers, but the spread already accounts for it.

The value is on Miami +13.5. The model gives them a half-point edge, and the low confidence suggests this is more of a lean than a lock. If you're looking for a moneyline play, avoid SF -950; instead, consider teasing the 49ers down or passing entirely.

Situational Factors

Weather won't be an issue: 71°F, 3 mph wind, partly sunny at Levi's Stadium. It's a non-conference game, so there's no division rivalry angle. The 49ers are riding high and widely viewed as the NFC West favorite. Miami's schedule outlook is grim, and this is viewed as a tough spot with their first realistic win possibly weeks away. That could mean a letdown spot for San Francisco, but more likely, the talent gap is simply too large.

Injuries

Miami's injury report is notably more impactful than Week 1, when every player finished the practice week available. Linebacker Ronnie Harrison has been downgraded. Rookie linebacker Chop Robinson landed on the injury report after a disappointing Week 1, casting doubt on his availability. And Kyle Louis will miss a few weeks with an injury. That thins a linebacker corps that will be tasked with slowing down McCaffrey and Black. The 49ers have no injuries of note.

Final Verdict

Pick: Miami +13.5 (confidence: low). The model's predicted score of 30-17 gives us a half-point edge, and the historical success of the Dolphins in this series adds a bit of value. The total is a slight lean to the over (47 predicted vs. 45.5), but it's not a strong bet. If you're playing the moneyline, SF -950 is too steep—tease it or stay away. Best bet: Miami +13.5.