With the season winding down and many September call-ups giving their teams a glimpse at the future, GMs around the league are taking notes regarding which holes they'll need to fill heading into the 2012 season.
With a top-heavy free-agent class that's rounded out with an abundance of over-the-hill former star's, many teams will try to upgrade their roster via the trade market this winter.
There were plenty of names who were rumored to be on the market before July 31st that ended up staying put, and many of those players will be back on the market come November.
In most cases, a team isn't looking to trade away their best player in order to rebuild. Rather, they are looking to get rid of a foolish contract of a player they want in their past. This doesn't mean the player is bad, it just means he isn't worth his contract. An acquiring team generally doesn't have to foot the bill, so many times they come out looking good.
Then, of course, there is the possibility that two team's will swap bad contracts, which seems to be a likely scenario this offseason.
Finally, there are a few players who could be moved simply because their team needs to trim payroll.
Here are the Top 20 Players Potentially Available This Winter.