During Saturday’s Week 18 slate, NFL fans are set to be treated to the best type of season finale, in which the winner goes on to claim its conference’s first seed and the loser falls all the way to No. 5 and has to play (in all likelihood) multiple road games. When the San Francisco 49ers host the Seattle Seahawks on Saturday at 8 p.m. ET, everything is at stake: the NFC West and a first-round bye.
The NFC also had this scenario in 2024-25, when the Detroit Lions defeated the Minnesota Vikings in the season finale to claim the No. 1 seed, though both teams ultimately fell in their postseason openers.
For Saturday’s pivotal clash, the Seahawks are 1.5-point favorites at DraftKings Sportsbook, with the point total set to 47.5. Seattle is -120 on the Moneyline, and San Francisco is +100.
DraftKings is offering a Showdown contest on the big game with $600,000 in total prize money. Below, I’ve prepared you for the contest with two Captain’s Picks, two FLEX options, and one fade.
Set your DraftKings fantasy football lineups here: NFL $600K Battle for a Bye [$200K to 1st] (SEA @ SF).
SHOWDOWN STRATEGY
Captain’s Picks
Brock Purdy ($15,300 CP) – After struggling through an injury-riddled start to his season, Purdy has been unbelievable after the 49ers’ Week 14 bye. In the last three weeks, the former Mr. Irrelevant has completed 74.2% of his passes for 893 yards, 11 touchdowns, and two interceptions while rushing for a further 83 yards and two scores (33.3 FPTS per game). His best fantasy performance came in Week 17 against the Chicago Bears despite seven-time Pro Bowl tight end George Kittle ($13,500 CP) sitting out. Purdy hasn’t had it easy — his average time to throw is the third-longest in football — but he ranks second in completion percentage over expectation.
Seattle’s defense could be a challenge, given that it has allowed the 10th-fewest FPTS to opposing quarterbacks this season, but the Cleveland Browns’ defense is even better, and Purdy had an okay game (16-for-29, 168 yards, one touchdown, and 17.1 FPTS) in cold and windy conditions. The Seahawks also allowed Los Angeles Rams signal-caller Matthew Stafford to rack up 457 yards in Week 16, the second-highest single-game total this season, and while Stafford is a notably aggressive quarterback, Purdy has similarly gaudy per-game numbers. The signal-caller could be especially effective if Kittle is able to play, as Seattle has struggled against opposing tight ends, allowing the 10th-most FPTS.
Kenneth Walker III ($11,100 CP) – Three years into their partnership, the Seahawks seemingly still haven’t figured out the first option between Walker and Zach Charbonnet ($10,800 CP), but Walker seems the more reliable Captain’s Pick with the higher ceiling. He’s been the better of the two on a per-play basis, averaging 4.5 yards per carry to Charbonnet’s 3.9, and with a 28.4-FPT performance in Seattle’s exhilarating comeback over the Rams two weeks ago, he has the higher single-game ceiling. Walker is also more of a factor in the receiving game, racking up more than twice as many yards and gaining two more yards per catch.
Either running back would be a decent choice against a San Francisco front seven that has been mediocre against opposing running backs, allowing the 13th-most FPTS per game. The 49ers have been particularly gettable through the air, allowing the second-most receptions and the 11th-most receiving yards to the position, which should further play into Walker’s hands. As is, San Francisco is pretty good at tackling and hasn’t allowed many explosive plays, but Walker has been better than Charbonnet at breaking off long runs and forcing missed tackles. He has the fourth-most 20-plus-yard runs and the sixth-most broken tackles.
FLEX Plays
Christian McCaffrey ($11,800) – Part of the appeal of picking Walker as Captain is to save budget for either McCaffrey or Seahawks wideout Jaxon Smith-Njigba ($11,600). San Francisco has needed to lean heavily on McCaffrey in recent weeks, giving him at least 20 carries in each of the past five weeks, and he’s delivered, averaging 126 scrimmage yards per game and scoring six total touchdowns (25.4 FPTS per game). He’s even been more efficient as of late, averaging 5.8 yards per carry across his last two games, although his 3.9 yards per carry is still the second-lowest average of his career.
In part because his impressive production hasn’t been based on efficiency, it almost doesn’t matter that Seattle has had the league’s best rush defense by several metrics, including yards per attempt and expected points added. The Seahawks have been exploitable by dual-threat running backs, allowing the most catches and sixth-most receiving yards to the position, and McCaffrey’s 890 receiving yards this season are the 12th-most in NFL history. Furthermore, Seattle has missed the seventh-most tackles, so McCaffrey could still be effective despite having the worst tackle-breaking season of his career.
AJ Barner ($4,400) – Since Rashid Shaheed ($6,400) suffered a concussion in Week 17, it’s not a guarantee that he’ll be able to play, and he might be limited even if he does suit up. If Shaheed isn’t 100%, Sam Darnold ($9,800) will lean even more heavily on Smith-Njigba, but fitting both McCaffrey and Smith-Njigba into a fantasy lineup is difficult. Instead, it makes more sense to choose a budget option in Barner, who’s scored a touchdown in each of the last two weeks (14.2 FPTS per game). In fact, Barner ranks third on the team with seven total touchdowns, out-pacing even Walker.
The 49ers just haven’t been very good against opposing tight ends, allowing the eighth-most FPTS per game to the position. They’ve been particularly exploitable in the red zone, allowing the fifth-most touchdowns. There’s also a steep drop-off from San Francisco’s top outside corner, Deommodore Lenoir, to its top slot corner, Upton Stout, and neither of the 49ers’ starting safeties is a particularly elite coverage defender, either. It might be a different story if Fred Warner was healthy, but the four-time All-Pro First Team honoree suffered a fractured and dislocated ankle in Week 6. Plus, San Francisco tends to operate in zone coverage, and Barner has been more effective against zone than man.
Fades
Jauan Jennings ($8,600) – Given how strong the Seahawks’ defense is, there’s insufficient room for two 49ers wide receivers, Kittle, and McCaffrey. Of the two wideouts, I prefer Ricky Pearsall ($8,000), who received more targets than Jennings in each of the last two games in which both played. Jennings’ recent production has been thoroughly dependent on whether or not he scores a touchdown — he’s had 42 or fewer yards in each of his last five games but has at least 12.2 FPTS in each because he’s scored in five consecutive games — and that’s not as sustainable as being a yards-eater.
That could be especially unsustainable against Seattle, which has allowed the ninth-fewest touchdowns to wideouts and the seventh-fewest FPTS overall. Plus, because Jennings likes routes between the numbers, he’s projected to face most of his targets against Nick Emmanwori, a sensational rookie safety, and both he and Pearsall should see plenty of snaps against Devon Witherspoon, the second-best coverage corner in the league this season. The Seahawks also prefer to operate in zone coverage, and while McCaffrey and Kittle have been better against zone than man, both Jennings and Pearsall are exceptions.
THE OUTCOME
Both of these teams have strong offenses led by true superstars in McCaffrey and Smith-Njigba, and I’d probably give the quarterback edge to Purdy over Darnold, especially given the latter’s track record in big moments, such as the Vikings’ game against the Lions last season. Kyle Shanahan also has more experience coaching pivotal games than Mike Macdonald does, even though Macdonald has been quite impressive in his first two seasons as a head coach.
San Francisco’s defense just might not be good enough, especially with its two best players, Warner and Joey Bosa, both out for the season. By ESPN’s Football Power Index, the 49ers grade out as the league’s eighth-worst defense, and by expected points added, they rank seventh-to-last. San Francisco also gets pressure at one of the league’s lowest rates, and in clean-pocket situations, Darnold is among the five most talented passers in football.
