Denver Broncos
The Denver Broncos have never been underdogs this season. Reuters

Only four teams remain alive on the road to Super Bowl XLVIII. They will compete on Sunday in the 2014 AFC and NFC title games.

Unlike in many years, the best teams from the regular season have advanced to play in the conference title games. The Denver Broncos and New England Patriots will meet after earning byes in the playoffs. In the NFC, the No.1 seed Seattle Seahawks will face the No.5 seed San Francisco 49ers. The 49ers were tied for the second-best record at 12-4, but were relegated to winning the wild card because they share the same division as their opponent.

Most of the matchups in the playoffs have been rematches from the regular season, and that trend continues this weekend. The Patriots beat the Broncos in Week 12, while Seattle and San Francisco faced off twice in 2013. Of the 10 playoff games in the first three rounds, eight have been rematches.

Both games are expected to be close, but they could be played very differently. The AFC matchup will likely be a high-scoring affair, while the NFC contest might not see much scoring. Denver and New England were two of the three top offenses in the NFL. The Seahawks and 49ers sport two of the best three defenses in all of football. The over/under in both games is separated by 15 points.

The Broncos have been favored in every games this season. The only time Seattle was named the underdog was when they visited San Francisco on Dec. 8.

Below are the complete betting lines for both conference championships, including the point spreads and totals. These are the consensus odds from multiple sportsbooks in Las Vegas.

Sunday

New England Patriots (+4.5) at Denver Broncos, 55

San Francisco 49ers (+3.5) at Seattle Seahawks, 40