8:10pm: Igarashi's two-year deal with the Mets is worth $3MM, tweets NPB Tracker. Given the cost of late-inning arms this offseason (Brandon Lyon, for example), this seems like a solid, low-risk investment for the Mets.
THURSDAY, 3:41pm: The Mets announced the signing of Igarashi, tweets Ken Davidoff of Newsday. It's a two-year deal, tweets Ed Price of AOL FanHouse. ESPN's Keith Law gave a scouting report a few days ago, calling Igarashi a "slightly wild power reliever" with a mid-90s fastball and a splitter he can throw for strikes.
8:41pm: Bart Hubbuch of the New York Post tweets that a Mets source has confirmed that the club has indeed signed Igarashi.
WEDNESDAY, 7:55pm: NPB Tracker (via Twitter) passes on a report from Japanese site Sanspo.com that the Mets have "a basic agreement" to sign reliever Ryota Igarashi. A follow-up tweet translated a comment from Igarashi's agent Arn Tellem, who says that "the fine points of the contract" are still being worked out.