The best defensive team in the NFL, the San Francisco 49ers, will host the Miami Dolphins today in a NFL showdown. The game will be on TV but you can watch free live stream by clicking here.

The Niners' defense (No. 3 in yards allowed, at 90.6 per game, and No. 2 in average yards allowed per carry, at 3.6)should shut down the Dolphins' lowly ranked offense, but of course, the major reason the NFL is so popular in the US is because anything can happen on any given night -- parity is key here.

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The Niners are also vunerable to rushing attacks, of which the Dolphins are somewhat experienced and skilled in. Though the Dolphins are led by a rookie quarterback, who may lack the experience to go against a pressure-packed defense on the road. 

The Dolphins are hanginng on for dear life near the bottom of the AFC playoff race, with a record of 5-7, tied with the New York Jets and Buffalo Bills for second (and last) in the AFC East. They will need to win every game left in the season to hope to make the playoffs. So yes, today is a must-win for them.

The good news for both sides is both teams are entering this game healthy, with very few players bitten by the injury bug. And there are some records at stake too. Miami's wide receiver, Brian Hartline, is on pace for a 1,000 yard season, which would be his first. Davone Bess, meanwhile, is inching towards the 1,000 mark too. That would also be his career high.