Samurai Japan Manager Hiroki Kokubo is currently in the United States. He visited Koji Uehara, Junichi Tazawa, and Masahiro Tanaka at Fenway Park in Boston on August 10. He will be in the US until August 17. His goal is to check in with Japanese players in the MLB. He is not in the US to recruit or check availability.
[UPDATE 8/13 @ 11:10pm]
Kokubo checked out Yu Darvish on August 12. He could not speak to Darvish directly because he was scheduled to start the day’s game.
Source: Sanspo 8/13/2016
[UPDATE 8/15 @ 5:00pm]
Kokubo visited Dodgers Stadium and met Kenta Maeda on August 14.
Source: Sponichi 8/15/2016
[UPDATE 8/16 @ 10:31pm]
Kokubo met Hisashi Iwakuma and Norichika Aoki on August 15.
[UDPDATE 8/18 @ 1:16pm]
Kokubo visited Ichiro on August 17.
Source: Sponichi 8/18/2016