Super Bowl Odds Update: Packers, Seahawks Tied Atop NFL Betting Futures ColumnistAugust 11, 2015

Green Bay Packers’ Aaron Rodgers (12) during the Green Bay Packers Family Fun Night NFL football training camp practice Saturday, Aug. 8 , 2015, in Green Bay, Wis. (AP Photo/Mike Roemer)
Mike Roemer/Associated Press

The NFL preseason is underway, and the league's four conference finalists from a year ago are the top four favorites on the odds to win Super Bowl 50 at sportsbooks monitored by Odds Shark.

The rest of the 28 teams in the league will be chasing the Green Bay Packers (6-1), Seattle Seahawks (6-1), Indianapolis Colts (9-1) and defending-champion New England Patriots (9-1) with the 2015 regular season set to kick off September 10.

New England will host the Pittsburgh Steelers (18-1) in the league's season opener and will probably do so without quarterback Tom Brady, who is slated to miss the first four games of the campaign due to a suspension related to the Deflategate scandal.

The biggest challenge for the Patriots in trying to become the first repeat champs since they did it 11 years ago will not be replacing Brady for the first month, but rather rebuilding a defense that suffered a number of key losses in the offseason. Gone are cornerbacks Darrelle Revis and Brandon Browner, along with defensive tackle Vince Wilfork.

Indianapolis was the victim of Deflategate and will have an excellent opportunity to get revenge if the team can earn home-field advantage. The Colts were routed 45-7 by New England in last year's AFC Championship Game and play in the conference's weakest division, giving them the perfect chance to finish with the AFC's best record.

New additions for the Colts this year include running back Frank Gore and wide receiver Andre Johnson, a pair of veterans who could help Indy make a run at Super Bowl 50.

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The Packers and Seahawks battled in an epic NFC Championship Game back in January, with the former falling to the latter 28-22 in overtime. This year, they meet again in Week 2 at Green Bay's Lambeau Field, and NFC home-field advantage could be on the line early just like in last year's season opener, won 36-16 by Seattle at home.

The Seahawks upgraded their biggest weakness offensively in the offseason by trading for tight end Jimmy Graham, while the Packers re-signed all of their key players from last season.

Other teams to watch on the NFL betting futures this year include the Dallas Cowboys (14-1), Denver Broncos (14-1), Philadelphia Eagles (22-1) and Baltimore Ravens (22-1).

The Cowboys lost 2014 NFL rushing champion DeMarco Murray to the Eagles, the Broncos have a new head coach in former offensive coordinator Gary Kubiak, and the Ravens will try to get wide receiver Steve Smith a Super Bowl ring after he announced that he will retire after this season.