Rotowire has teamed up with Yahoo! Sports this Fantasy Football season to give our users the opportunity to play against the fantasy pros.

Each week we'll offer Rotowire users a chance to sign-up for a 12-team fantasy football league that pits them against one of our fantasy football experts.

The season-long NFL commish leagues will be hosted on Yahoo! Sports, which is the leading fantasy provider on the Internet, home to over 5 million fans playing the #1 fantasy football game available ? all for free!

This week our users will be pitted against Rotowire co-founder and co-host of our Sirius XM show, Jeff Erickson. The league will be filled first-come, first-served, so follow the below instructions to sign-up and move fast to reserve your spot in the league!

1. Click through to this link
2. Select "Join A League"
3. Enter league ID (534740) and password (rotowirejeff)
4. Create your team and complete the registration.

For any questions or difficultities with the registration process please email me at shannon@rotowire.com.

If you don't get into this week's league, we'll have future challenges with a new expert each week until the football season kicks.

Also, be sure to check out why Yahoo! Sports is the #1 FREE Fantasy Football game on the web. Offering:

- Same day drafts
- Custom playoff seeding
- Game-time waivers
- Player availability across all leagues
- New Yahoo! Fantasy Football mobile app for 2012 season with better stabilization & increased features
- Pro Leagues -- step it up a notch and play in public cash prize leagues

Get ready for kickoff by signing up now!