The season is over and the hot stove is upon us. It used to be we had to wait a while until players filed for and then signed in free agency. It doesn’t work that way anymore.
Guys whose contracts have expired immediately become free agents after the season ends (i.e. last night) and signings can begin after a short, five-day team exclusivity period. That ends on Saturday at 12:01 AM, which means you should stay up late on Friday night to see the dominoes start falling.
As for those dominoes: there are 137 of them. You can read the full list at the MLBPA page. A ton of those are subject to team or player options that will be exercised between now and midnight Friday, but they are all players who, theoretically, could switch teams.
The biggies, obviously, include Josh Hamilton, Zack Greinke, Michael Bourn and, of course, Ryan Theriot, who guarantees a World Series championship, apparently.