Record vs. 49ers at Levi's Stadium: 0-1
Key additions: WR Brandon Aiyuk, WR Travis Benjamin, DT Javon Kinlaw, T Trent Williams
Key departures: DT DeForest Buckner, WR Marquise Goodwin, WR Emmanuel Sanders, T Joe Staley
Key stat: 1,320
According to Pro Football Reference, the 49ers defense allowed the fewest air yards on completions by a wide margin with 1,320. The New England Patriots were the next closest team with 1,739.
Player to watch: DE Nick Bosa
Bosa lived up to the lofty expectations that were set for him during his rookie season by posting nine sacks during the regular season and four more during the 49ers' three postseason games.
To say that Bosa, last year's No. 2 overall pick, is a game-plan wrecker would be putting it mildly. The problem is that he is one of many talented players upfront for San Francisco, who invested multiple first-round picks in the trenches. It paid dividends in 2019, as the team's defensive line came at opposing offenses in waves.
Stopping Bosa is opposing team's No. 1 priority, but he is far from the only one to watch.
Team preview: 13-3 in 2019, first in NFC West, NFC Champions
The 49ers did not rest on their laurels of reaching the Super Bowl last season and set out to deepen their roster depth in 2020. They did that by adding Williams to the offensive line to replace Joe Staley, who retired after 13 seasons in San Francisco.
Yes, the 49ers lost Sanders and traded Goodwin to the Eagles but added Aiyuk in the draft and Benjamin via free agency while still boasting a bevy of weapons like tight end George Kittle, running back Raheem Mostert, and wide receiver Deebo Samuel. Not to mention, it's another year in the Kyle Shanahan offense for quarterback Jimmy Garoppolo.
Defensively, they traded Buckner to the Colts, but quickly drafted his replacement in Kinlaw. The rest of the defense, which was one of the league's best in 2019 still features talent all across the board. All-Pro cornerback Richard Sherman, team tackling leader Fred Warner, and team sack lead Arik Armstead are just few of the talents the defense brings back for 2020.