Nickel blitz gave Bo Nix problems on that drive.

Have a day, Chase Lucas. Forced safety via intentional grounding last drive and just locked up Troy Franklin for PBU on Nix pass inside #49ers own 10-yard line.

Three Bo Nix drives, three Broncos points. #49ers CB Darrell Luter Jr. made good play on ball intended for Courtland Sutton in end zone to force FG.

Looks like Mac Jones' day is done. Carter Bradley in at QB to start #49ers fourth offensive drive. Jones stats: 4 of 7 passing, 74 yards, 1 INT ... had some shaky moments after smooth opening drive.

Bo Nix vs. #49ers defensive reserves, sans LB Dee Winters: 6 of 11 passing, 31 yards, 0 TD, 0 INTs. Drive one: punt. Drive two: safety. Drive three: FG.

#49ers LB Tatum Bethune walks off slowly after trainer appeared to check out his right foot.

#49ers announce LB Tatum Bethune suffered ankle injury. Questionable to return.

Carter Bradley playing catch with Broncos LB Karene Reid.

Ankle tape working wonders

Lucas, Luter and Bethune gather for a mid-play meeting while Lucas Krull catches eight-yard TD with a lot of green grass around him. Broncos lead #49ers 13-9. About a minute to go till halftime.

#49ers rookie S Marques Sigle (knee) is questionable to return.

#49ers backup defense looked better against Nix and company ... Broncos offensive reserves are cooking right now.

#49ers RB Ameer Abdullah is down. He grabbed at his rib cage after fumbling.

Carter Bradley and Tanner Mordecai doing their best to ensure Jake Moody stays on the sideline.

#49ers rookie CB Upton Stout didn’t play because of a tight calf, Kyle Shanahan said.

Kyle Shanahan said Mac Jones "did a real good job" in his #49ers debut. Mac Jones? He wasn't as charitable. sfchronicle.com/sports/49ers/a…

Robert Saleh made #49ers second-stringers look like starters against a Bo Nix-led Broncos offense, if only for a quarter and change. Denver won 30-9, but no thanks to Nix, whose three drives previewed what Saleh's second act in S.F. could look like. sfchronicle.com/sports/49ers/a…

#49ers’ undrafted DT Sebastian Valdez, "The Hulk," outperforms his more heralded teammates sfchronicle.com/sports/49ers/a…

Can confirm #49ers signed RB Jeff Wilson, who rushed for 1,733 yards and 15 touchdowns across four and a half seasons in S.F. (2018-22). Spent last two and a half seasons with Dolphins. Wilson, 29, added to holdover Niners thinned RB room.