I was listening to the Rays-White Sox game on my XM Radio on my way home today and I heard the Tampa Bay broadcasters mention that Akinori Iwamura had "a lot of post season experience in Japan". The Swallows only made the Nippon Series once with Iwamura on the roster - in 2001 when they beat the Buffaloes in 5 games. Aki had a good series - he hit .450 (9-for-20) with 5 RBI's, good enough to be named an "Outstanding Player" for the Series. But I'm not sure 5 games qualifies as "a lot".
Here's his "Outstanding Player" card from the 2001 BBM Nippon Series set (#S59):