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It could've been either Tomo Ohka or Masato Yoshii you're thinking of. Both were MOR types in Japan and had some decent BOR-type years in the NL. Yoshii was mostly with the Mets, but spent some time with the 'Spos and Ohka bounced around the NL for what seemed like forever with the most time being with the Exposés.
Heck, they even both played for the Suppositions together in 2001 and 2002.