49ers-Bengals: Studs and duds at halftime

Here are the studs and duds of the 49ers first-half visit to the Cincinnati Bengals.

CINCINNATI — Here are the studs and duds as the 49ers take a 24-10 lead into halftime Sunday in the Bengals home opener:

STUDS

Jimmy Garoppolo: He is 11-of-18 for 181 yards with two touchdowns, an interception, no sacks and a 108.8 rating. After his first pass produced a third-down conversion to Kyle Juszczyk, he found Marquise Goodwin wide open for a 38-yard touchdown 47 seconds into the game. On the next series, Garoppolo again produced a touchdown pass, this going for 39 yards to Raheem Mostert on a screen, giving the QB a 158.3 perfect passer rating (5-of-6, 96 yards). Even Garoppolo’s second-quarter interception didn’t cost the 49ers points (Bengals missed a field goal).

Arik Armstead: Taking advantage of left tackle Cordy Glenn’s absence, Armstead powered his way past Andre Smith to sack Andy Dalton on the game’s first snaps. DeForest Buckner and D.J. Jones tagged Dalton down at the Bengals 4.

Marquise Goodwin: He slipped wide open down the left side of the field, snagged Garoppolo’s pass at the 15-yard line, trotted into the end zone for his first touchdown of the season (38 yards) and celebrated with an Olympic-esque long jump.

Matt Breida: His 34-yard, reverse-field, avoid-defenders run to the Bengals 15-yard line (on third-and-1) is one of the best we’ve seen in years. It followed Breida runs of 4 and 7 yards, and that set up Jeff Wilson’s 2-yard touchdown run for a 21-7 lead.

Ronald Blair: He showed up big in the third series, record tackles behind the line of scrimmage against running backs Joe Mixon (minus-2 yards) and Giovani Bernard (minus-3 yards).

Nick Bosa: That right ankle injury doesn’t seem to negatively impact him, nor his snap count. He narrowly missed a sack as he grabbed Dalton’s ankle on a second-quarter pass, and Dalton again slipped from Bosa’s grasp later in the period but was flagged for throwing beyond the line of scrimmage in an illegal pass. He got called for offside just before the half.

Kwon Alexander: Hey, he lasted past the first quarter, and he keyed a strong defense with his tackles, swagger and speed. Mixon and Bernard weren’t making it to the next level. He made his first interception as a 49er by covering Tyler Eifert and getting down field 74 seconds until halftime, after Nick Bosa flushed Andy Dalton the pocket.

Special teams: Mitch Wishnowsky’s second-quarter punt was caught by 49er D.J. Reed at the Bengals 3 with 4:42 remaining. Raheem Mostert and Emmanuel Moseley had excellent tackles in coverage earlier. Robbie Gould tacked on a field goal just before halftime for the 24-10 lead.

DUDS

K’Waun WIlliams: He was the goat for the Bengals game-tying touchdown drive in the first quarter, first allowing a 47-yard completion to a wide open Tyler Boyd and then unable to cover tight end Tyler Eifert on a 1-yard touchdown catch. Williams also had a holding penalty declined on that drive as the Bengals still completed a third-and-7 pass for an 8-yard conversion. He missed a tackle on the second series, but he made six tackles by halftime, including a touchdown-saving one on John Ross.

Solomon Thomas: He committed a late-hit, roughing-the-passer penalty after Dalton completed a pass (for no gain) with Nick Bosa grabbing at Dalton’s right ankle.

Richie James: He managed just 13 yards on a kickoff return, so the 49ers second possession started at their 16-yard line.

Mike McGlinchey: He committed a false-start penalty to back the 49ers up to the 20-yard line, then almost allowed a sack to Carlos Dunlap on the next snap.

Ahkello Witherspoon: Kudos to him for nearly making a pick-six in back-to-back games, but after dropping the second-quarter offering, he reverted to his soccer skills and punted the ball into the stands for a delay of game penalty.

Tarvarius Moore: Got juked at midfield on a 34-yard reception by John Ross.