Even though the trade season got started in a big way on Wednesday, the meat of the offseason market won't develop until the winter meetings begin on December 9.
Teams have been actively monitoring the strengths and weaknesses of their 25-man rosters and minor league systems all year. It is time for that hard work to pay off by putting pieces together for a playoff push in 2014.
Of course, not all teams are looking to deal prospects because they are trying to rebuild their franchise for the future. It wouldn't make sense for the Houston Astros to start trading from the minor league system.
We want to look specifically at the teams that should theoretically be in "buy" mode this winter. These are teams that either just missed the postseason in 2013, or will have plenty of holes to fill after making a run in October.
The players listed aren't necessarily on the trade block, but they would make sense as key pieces in a trade for their current team.
Note: All stats courtesy of MiLB.com unless otherwise noted.