San Francisco 49ers vs Minnesota Vikings Live Stream Free: Watch Online NFL Preseason 2013 Sunday Night Football

San Francisco 49ers vs Minnesota Vikings takes place on Sunday Night Football in tonight's special NFL Preseason 2013 game. The game is scheduled to start at 8 p.m. ET and can be watched online through free live stream (details below).

(Photo: Reuters/Robert Galbraith)San Francisco 49ers kicker David Akers (2) reacts between Detroit Lions' Jacob Lacey (L) and Kevin Barnes during their NFL football game in San Francisco, California September 16, 2012.

The 49ers will be hoping that this is their year and that they can go all the way to the Super Bowl. However, so far this preseason they have not shown the intensity or the freedom in their play that they will need to set up a drive for the postseason.

On Aug. 8 in their first preseason encounter they hosted the Denver Broncos, but were unable to claim the win in a low-scoring 6-10 loss. They did show improvement for their game last week when they went on the road to Kansas City, where they won another close game 15-13.

They will want to show further improvement tonight and build on their win last week, so that they can continue gaining momentum towards their opening day match up on Sept. 8 when they will be hosting the Green Bay Packers.

So far neither the 49ers' rush nor pass offense has really let loose, and have struggled to express themselves fully in the two games so far. They have a skilled team and will be disappointed so far at their performances. A big improvement in both areas of the field will be needed if they are to put in some early season performances to send a message to the rest of the NFL that they are in it to win it this year.

Meanwhile, the Vikings' preseason preparations have gone off the rails so far. They have lost both their preseason matches so far; a 13-27 loss at home to the Houston Texans, and a 16-20 loss on the road to Buffalo.

They will be desperate to get a win under their belts tonight, and if they fail to do so tonight they risk hitting the regular season opening day without a win, and potentially without much confidence.

After tonight's game with the 49ers, the Vikings will have one more preseason game left next week when they host Tennessee in a Thursday night game. They have a lot of work to do to get to the level they want before the season begins.

There's a lot at stake for both teams tonight as preparations towards the NFL season continue, and this should be a good game for NFL fans.

San Francisco 49ers vs Minnesota Vikings starts at 8 p.m. ET and can be watched online through free live stream by clicking here.