Why NFL Playoff Underdogs Could Shape the 2026 Postseason

The NFL playoffs are defined by uncertainty. Regular-season success earns teams a place in the bracket, but once the postseason begins, outcomes are often decided by small moments rather than long-term trends. That reality has repeatedly opened the door for underdogs to influence how a playoff run unfolds.

As the 2026 postseason approaches, the conversation is once again shifting toward possibility rather than prediction. Lower-seeded teams enter January with the same opportunity to advance as the favorites they face, and history shows that early expectations rarely survive intact. In a format built on single-elimination pressure, underdogs can shape the postseason simply by executing when it matters most.

Advanced Metrics Reveal Hidden Contenders

Traditional seeding often fails to capture a team’s true strength, especially in seasons shaped by close games and uneven schedules. That limitation matters when people bet on the NFL playoffs, because seeding often influences expectations more than underlying performance. Advanced metrics help close that gap by adjusting for opponent quality, efficiency, and game context to show how teams are actually playing.

This discrepancy is evident in the NFC, where ESPN’s Football Power Index rates the Los Angeles Rams as the top team despite their fifth seed. That ranking reflects efficiency on both sides of the ball rather than just the win-loss record. Metrics like this highlight teams that are better than their seeding suggests.

Lower-seeded teams that rate highly in advanced models tend to be undervalued entering the playoffs. They often lose close games early in the season or face complex schedules that depress records. Once the postseason begins, those underlying efficiencies become far more relevant than seeding.

Home-Field Advantage Isn’t Just for Favorites

Home-field advantage is often discussed as a benefit for top seeds, but historical trends suggest underdogs may benefit more. The pressure placed on heavily favored home teams can alter decision-making and amplify mistakes, especially early in games. Several long-term trends reinforce this idea:

• Home underdogs of four or more points are undefeated against the spread over the last 50 years.
• Home teams with a win percentage above 75% have consistently struggled to cover playoff spreads.
• Crowd energy often favors urgency and aggression rather than conservative play.

These patterns suggest that expectations, not the environment, shape outcomes. Home underdogs often play freely, while favorites are burdened by the need to justify their status. That psychological difference can influence playoff results just as much as tactical factors. 

Injuries Are Cracking the Armor of Favorites

Health often becomes a defining factor once the playoffs begin, and even teams viewed as favorites are vulnerable when key contributors are sidelined. The Seattle Seahawks are dealing with injuries that affect critical areas. Starting left tackle Charles Cross is ruled out, creating concerns in pass protection, while safety Coby Bryant is doubtful. Offensive lineman Josh Jones is also questionable, adding uncertainty to the line.

These types of injuries tend to impact favorites more sharply because their systems rely on cohesion and consistency. Losing a starting tackle or dealing with instability in the secondary forces schematic compromises that opponents can exploit. In playoff settings, where game plans are highly targeted, even a single weak point can influence how an entire matchup unfolds.

The Los Angeles Rams and Denver Broncos face similar challenges. The Rams will be without offensive guard Kevin Dotson and cornerback Josh Wallace, while the Broncos have key players sidelined, including Omarion Hampton. As injuries accumulate, even top teams enter the playoffs with less room for error.

Late-Season Momentum Is a Playoff Equalizer

Late-season momentum often benefits underdogs more than favorites. FanDuel NFL Weekly Matchup Guide helps show how teams perform week to week by focusing on recent results and matchup details rather than season-long records. Teams that improve late can enter the playoffs playing better than their record suggests, creating opportunities once postseason games begin.

A clear example came in the 2023 playoffs, when the Green Bay Packers were betting underdogs in both of their playoff games. After closing the regular season with improved execution, they carried that momentum into the Wild Card round and defeated a heavily favored opponent. Even though they were eliminated the following week, their presence as underdogs mattered.

Quarterback Play Can Override Talent Gaps

Quarterback performance remains the single most powerful variable in playoff football. One elite or timely performance can erase disadvantages in roster depth or experience. Underdogs with quarterbacks who can elevate under pressure are always dangerous.

The Green Bay Packers benefit from Jordan Love, who has excelled when blitzed or forced off his first read. Meanwhile, the Buffalo Bills continue to rely on Josh Allen to lift an inconsistent roster. Quarterbacks who can create outside structure introduce volatility that favors underdogs. 

The Outsized Impact of Underdogs

Underdogs shape the NFL playoffs by changing outcomes at critical points rather than by dominating the entire postseason. A single upset can eliminate a favored team, alter future matchups, and shift the path for everyone left in the bracket. In a single-elimination format, that influence is immediate and lasting. Underdogs affect the postseason by executing well in one high-leverage game. As the 2026 playoffs unfold, those moments are likely to help shape the postseason.