Ichiro Suzuki, Hiroki Kuroda, Daisuke Matsuzaka, Koji Uehara, and Takashi Saito became free agents on Monday. They will be allowed to negotiate with other teams beginning on Saturday. Source: MLB.com FA List
Sanspo notes that Boston Globe thinks there is a chance the Yankees will sign Kuroda to a one-year deal with some interest from the Dodgers as well. Sanspo also notes that CBS is reporting Kuroda does not want a multi-year deal because he wants to keep his options open; the Red Sox are a possibility. Source: Sanspo 10/30/2012
Hisashi Iwakuma is not yet a free agent because there is a clause in his contract that gives the Seattle Mariners until Saturday to sign him.
Some of you may wonder why pitcher Hisashi Iwakuma isn't on this list. Very good question. When he signed a one-year deal as a free agent from Japan in January, Iwakuma's contract called for him to be granted his release if he can't reach agreement with the Mariners by Saturday (the same day that free agents can sign with other teams). If Iwakuma doesn't sign by Saturday, he thus would become a free agent, but technically he is not one right now. Apparently, Iwakuma could actually delay his request for release beyond Saturday, but that's considered unlikley. In essense, the stipulation makes Iwakuma no different than any other free agent: His team has a six-day exclusive window to re-sign him, then he becomes free to negotiate with other teams.