NPB Enterprise (Samurai Japan) announced today that they signed Asics to a Diamond Partner agreement.
Source: NPB Enterprise 5/18/2017
[UPDATE 6/26 @ 10:27pm]
The two sides reportedly agreed to a four-year deal that runs through to the end of May 2021.
Source: Nikkan Sports 6/26/2017
Official Suit Partner
Official Ticketing Partner