49ers CB Ambry Thomas broke his forearm tonight and will be sidelined indefinitely.

I had questions about the 49ers' QB depth but Brandon Allen is answering at least some of them with a very crisp outing here in Nashville tonight

From @NFLGameDay Kickoff: As the Brandon Aiyuk turns... ? pic.x.com/3pjuav7pfc

That wasn't even close. The missile Malik Mustapha made the fourth-down stop. I'm sure Kyle Shanahan isn't keen on using too many challenges in the preseason, but you've got to stick up for your young players in big confidence-building moments. This will be overturned

Jordan Mason on Dominick Puni: "Oh, I felt him, 100 percent. Because I was short until he came and pushed me."

This is essentially Tennessee's first-team offense vs. the 49ers second-team defense. Only probable SF starter out there is Ji'Ayir Brown

49ers' first-team offensive line for this preseason opener: LT Chris Hubbard LG Aaron Banks C Nick Zakelj RG Dominick Puni RT Colton McKivitz

5 carries, 30 yards and a manly TD for Jordan Mason, the hometown kid here in Nashville. What a cool moment for the 49ers running back

@LombardiHimself: 49ers RB Jordan Mason grew up in Gallatin, Tennessee -- just outside Nashville. He has several family members in attendance today, including his dad, who helped train Mason in the summer heat

There's been good and bad with Dee Winters. Important to be balanced if we're going to evaluate his push for playing time: -Key missed tackle vs Pollard -Electric close/hit on Levis -Great TFL (missile!) -Crossed up in space on Ridley YAC

Kalia Davis split that double team with the quickness of a former linebacker!

@TheSFNiners: #49ers Kalia Davis has been living in the backfield on this drive https://t.co/TJaVmv2Dge

This aged like Brock Purdy halftime playoff takes

@GottliebShow: Steph ain't helping kids. Loose with ball, minus defensively

Just saw a group of at least 6 Cody Schrader jerseys. Big day for the rookie!

Ronnie Bell was the lead blocker for Trent Taylor on the 49ers' first try at the new kickoff return. They treated it very much like a run play. I do think the Kyle Juszczyk/Deebo Samuel tandem will be the one of choice once these games matter

Which is why Saubert has clearly held the No. 2 TE spot since the start of camp

@Graham_SFN: Eric Saubert is clearly the best blocking TE the 49ers have not named George Kittle

Alex Barrett has been on the 49ers' practice squad since 2019, with some active roster call-ups in that span. But he's put in a lot of work for the team. Deserves some recognition -- a half-decade run in an NFL building is nothing to scoff at

DL Jonathan Garvin, whom the 49ers signed yesterday, and former Titan Shakel Brown made that fourth-down stop on Jabari Brown

Stanford product Curtis Robinson and Wake Forest rookie Malik Mustapha made some excellent tackles for the 49ers to end that drive. That reminds me that Stanford and Wake Forest played each other in 2009 and 2010. Alas, that was well before Robinson and Mustapha's time

The Titans swallowed the 49ers' kick coverage in blocks -- and Jake Moody actually had a key tackle opportunity that he missed. It wasn't a last-line-of-defense opportunity. So that return confirmed that kickers will indeed be key parts of coverage units. Plan accordingly

One game check for Trent Williams is $1.11 million. The 49ers have the ability to fine him up to that amount for every missed preseason game, but that's up to their discretion. The missed practices are mandatory, non-forgivable fines

@MaioccoNBCS: Trent Williams was a holdout for the first 13 practices of 49ers training camp. At $50,000 a day in fines, that's $650,000. According to the CBA, he is also subject to a fine of one regular-season game check for each preseason game missed.

The San Francisco 49ers opened their preseason schedule Saturday against the Tennessee Titans.

While most of the 49ers’ starters sat out, a handful of players who are expected to earn starting jobs in Week 1 took the field for the first exhibition match of the year.

Left guard Aaron Banks was among the starters. So was right tackle Colton McKivitz. Rookie third-round pick Dominick Puni also looks to be on track for a starting role in 2024.

He got the start in the preseason opener after taking hold of the right guard job in camp when Spencer Burford and Jon Feliciano both went down with injuries