The Ravens slaughtered the Patriots in the 2009 AFC Wild Card Game. To this day, it ranks as one of the most painful games in New England's franchise history.
The Patriots repaid the favor in 2011, delivering a devastating blow to the Ravens in the AFC Championship Game. It's a loss that Baltimore's players and fans will never forget.
These wins and losses left scars on these teams. Amazingly, these games are just the tip of the iceberg. There's a great article on Boston.com that outlines the history of this brutal rivalry and explains how the mutual dislike was woven into the fabric.
The bitterness between these teams cannot be removed, which is why their clashes are so filthy, so brutal and so fun to watch.
Sunday night is huge. For these teams and their fans, this is the biggest game of the season. Here are the most critical matchups between New England and Baltimore.