For any MLB team, a successful offseason is one that improves the current roster and solidifies the long-term plan. The following grades reflect that simple criteria.
Trades, waiver claims and free-agent signings were influences in every case. For certain clubs, retirements and recent injuries have been significant, too. Moreover, teams are being held accountable for missed opportunities and any weaknesses that haven't been addressed yet this winter.
The "key additions" for these teams are players who didn't finish 2012 with the organization, but figure to contend for a 25-man roster spot. Most "key subtractions" have found new homes already, while others are free agents who will not be pursued by their former teams.
Let's assess offseason performance thus far.
*On each slide, "all offseason activity" links to MLBDepthCharts, which provides a comprehensive list of transactions.