There really haven't been very many Japanese hitters in MLB and most of them have pretty glaring discrepancies between their Japan stats and MLB stats. The most glaring example, of course is: Tsuyoshi Nishioka of the Twins, who put up a .226 BA and a scary bad .278 OBP last season. This was after hitting .346 with a .423 OBP in Japan in 2010! (Nishioka has a career .380 OBP in Japan) Kosuke Fukudome had a .443 OBP and .963 OPS in Japan in 2007, his MLB OBP has been a solid .360 but with just a career .760 OPS. I wasn't able to find So Taguchi's complete Japan stats, but his batting average in Japan appears to be fairly similar to his MLB stats (career .279 BA, .331 OBP in MLB) Tadahito Iguchi provides interesting insight: before coming to MLB, Iguchi's last two years in Japan he hit .340 with 27 HR's and 109 RBI's in 2003 and hit .333 with 24 HR's and 89 RBI's in 2004 (both seasons in Japan). He had a couple of fairly productive seasons with the White Sox in 2005-2006 before bottoming out in 2008 with a .232 BA and .292 OBP (his career MLB BA was .268 with a .338 OBP). Really not awful career stats by any means, but what is interesting is that has since gone back to Japan and in the last 3 seasons (2009, 2010 and 2011) he has posted a .281 BA and .389 OBP in Japan. In 2009, the season after hitting .232 with a .292 OBP in MLB, Iguchi hit .281 with a .391 OBP in Japan! The next season he hit 17 HR's, drove in 103 with a .412 OBP Akinori Iwamura put up OK to pretty good MLB stats (he got on base well), .267 BA, .345 OBP but only a .720 career OPS. What is interesting about him is his huge power drop off coming to MLB: this is a guy who hit 44 HR's in 2004, 30 HR's in 2005, and 32 HR's in 2006 (all in Japan, with batting averages over .300 each of those years), then he goes to MLB and hits 7 HR's with Tampa and a .770 in 2007 (his age 28 year). .729 OPS the next season and 6 HR's Kazuo Matsui posted a .267 BA, .321 OBP, and .701 OPS in his MLB career. 32 career HR's in 7 seasons. Kazuo Matsui hit 33 HR's in 2003 alone in Japan. (in 2002 he hit 36 HR's with a .332 BA in Japan). Kazuo Matsui had 7 straight seasons of batting over .300 in Japan until coming over to MLB in his age 28 season Of course, Ichiro and Hideki Matsui have been very good to great MLB ballplayers. But even Ichiro had elevated stats (especially power stats) in Japan http://www.japaneseballplayers.com/en/player.php?id=ichiro Check out Hideki Matsui's Japan stats, the guy was hitting like Mickey Mantle over there http://www.japaneseballplayers.com/en/player.php?id=matsui My point here is not at all intended to be racially motivated. It is more that Japanese stats, so far, should be taken with a grain of salt and might be a lot more comparable to US college baseball stats than AAA or AA stats