Seattle Seahawks running back Kenneth Walker III totaled 156 yards from scrimmage in Week 3. The second-year back has maintained his lead role though he has seen his snap share shrink week by week. Ironically, Walker saw his biggest week so far in 2023 even with his snap share dropping to 49%. Walker's effectiveness in his role, though, has made him an invaluable piece of Seattle's offense so far this season. The Seahawks are on the road in Week 4, facing the Giants on Monday night. New York has given up at least one touchdown per game to opposing running backs and Walker will be in line for another productive day. He is a must-start for Week 4.

Seattle Seahawks quarterback Geno Smith will face the New York Giants on Monday night in Week 4. After a dud of a season opener, Smith recovered well in Weeks 2 and 3, averaging 312 passing yards with a 71% completion rate. The Giants rank third to last in defensive DVOA against the pass and give up the fourth most points to opposing quarterbacks. The Seahawks' offensive line is the biggest concern, as they are the worst in the league at allowing quarterback pressures. In spite of this, Smith has only suffered five sacks and thrown one interception in 2023. Fantasy managers can plug Smith in to start in Week 4 as he is a safe bet to put up QB2 numbers with QB1 upside in a favorable matchup.

San Francisco 49ers rookie wide receiver Ronnie Bell may be in line for significant playing time for the second consecutive week when the team hosts the Arizona Cardinals on Sunday. Last week with Brandon Aiyuk sidelined, Bell caught both of his targets for 24 yards and scored his first NFL touchdown on his first career reception. Although Aiyuk is returning this week, Deebo Samuel (ribs, knee) is questionable, and usual third receiver Jauan Jennings (shin) is doubtful. If both Samuel and Jennings are sidelined, Bell could be a sneaky but risky last-minute pickup and play. However, if at least one of them plays, Bell should not be considered for fantasy lineups.

In Week 4, fantasy managers should keep a close eye on Arizona Cardinals kicker Matt Prater as he lines up against the San Francisco 49ers. Prater has been remarkable over the first three weeks of the season, boasting a total of 32 fantasy points. In Weeks one and three, Prater nailed 12 fantasy points against a pair of solid defenses in Washington and Dallas. His powerful kicks combined with a Cardinals' offense that will most likely have trouble moving the ball against a formidable San Francisco defense could result in a solid week for the veteran. As an above-average option at the kicking position, don't be afraid to start him.

San Francisco 49ers running back Jordan Mason could be in line for snaps when the team hosts the Arizona Cardinals on Sunday. Elijah Mitchell is the usual backup to Christian McCaffrey but the former is questionable with a knee injury sustained in Thursday's practice. So far this year Mason has three carries for 11 yards and no receiving targets. Even if Mitchell doesn't play, Mason is unlikely to return significant value in fantasy leagues behind a healthy workhorse in McCaffrey. Although he hasn't seen any offensive snaps yet this season, it's also possible that Tyrion Davis-Price could get in the mix, further muddying the waters. It's best to leave all non-McCaffrey 49ers running backs out of fantasy lineups this week.

The Arizona Cardinals' defense will have their work cut out for them in Week 4 as they travel to face the San Francisco 49ers. The Cardinals currently boast the league's 21st-rated passing defense and have allowed four players to catch a touchdown against them in the first three games. With star safety Budda Baker still currently on IR, there is even more pressure on the Cardinals to stop the San Francisco passing attack. In addition to stopping the pass, the Cardinals rank slightly below average (18th) against the run, and will need to bottle up Pro Bowler Christian McCaffrey to keep the game close. The 49ers offense is at or near the top in many statistical categories, and as such the Cardinal defense remains too risky of a unit to trust. There are better fantasy options for Week 4.

Arizona Cardinals tight end Zach Ertz should be considered a bench stash this week against the San Francisco 49ers. As the season has gone along, Ertz's fantasy production has sharply declined. Prior to Week 3, Ertz was heavily involved in the Arizona passing game but was an afterthought in the team's upset win over Dallas. In addition, the 49ers have so far allowed the ninth-fewest fantasy points to tight ends. Since it remains to be seen how heavily the Cardinals will utilize him, Ertz is currently a risky option. Unless fantasy managers have no other choice, he's best left on the bench for Week 4.

Arizona Cardinals rookie wide receiver Michael Wilson could be a sleeper in the team's Week 4 matchup against the San Francisco 49ers. In Week 3 Wilson caught both of his targets for 86 yards to help secure the team's 28-16 win. The rookie has been productive in limited chances and seems to be slowly coming along as Arizona's big play threat. While he isn't quite trustworthy for fantasy lineups just yet, Wilson is a useful stash in deeper leagues should his role continue to grow. His Week 4 matchup is daunting, but he could show off his big play ability should the Cardinals fall behind early. He currently remains a risky boom-or-bust fantasy option.