Having finally gotten around to calculating win shares in NPB from 1989 to 2015, I might as well use them to ask the question: How often are Japan’s MVP winners actually in the ballpark?

While every system, including WAR is going to catch some flak for its omissions and assumptions, Win Shares is a good match for Japan because a lot of data, particularly UZR for recent players, is not publicly available.

One win share is equivalent to a third of a win and what is really neat is that the win shares for pitchers correspond very well over a period of time with actual pitching wins. Of the 50 MVPs selected over the past 25 years, there have been 15 players selected who were, through this measure, vastly underqualified for the award. Of those 15, it should not surprise anyone who follows Japanese baseball that 12 were pitchers.

The most egregious selection since 1991 was left-hander Tsuyoshi Wada, the Pacific League’s 2010 MVP, whose 13 win shares were the fewest of any winner since then. The player with the most win shares that season (34) was the first shortstop to win a batting championship and a Golden Glove in the same season, Tsuyoshi Nishioka. Of the 50 actual MVPs, 31 either led their league in win shares or were within 3 win shares and have to be considered really good candidates. Since I first wrote this, I have extended my win shares calculations to 1970, and Wada’s MVP stands as NPB’s worst choice in 46 years.

If MVPs were decided by an objective estimate of contributions to wins and losses, who in the past 25 years would have won the most MVP awards? If you guessed Matsui, you would be correct. You can go with Hideki Matsui or Kazuo Matsui, both led their league in win shares five times. Hideki actually won two, while Kazuo won one.

Which player in Japan was most poorly represented in MVP awards? That title might go to Hirokazu Ibata during his heyday as the defensive leader of the Chunichi Dragons. Ibata led the Central League in win shares in 2004, ’07 and ’09, although he did so with fairly modest totals of 24, 24 and 26, respectively.

Who has had most valuable season over the past 25 years? One wouldn’t have to look far for that one. After a year in which he led the CL in seven offensive categories, including being the second player in NBP history to surpass the runner-up in runs scored by 30 or more (and the one not named Sadaharu Oh) , Yakult Swallows second baseman Tetsuto Yamada raked in 47 win shares in a 143-game season. Although the schedule has increased over this period from 130 games to as many as 146, Yamada’s 2015 season can arguably called the best in Japan in the last 25 years, narrowly beating out Ichiro Suzuki’s 1995 MVP season for the Orix BlueWave.

The other three in win shares per game top five are: No. 3 Yuki Yanagita 2015; No. 4 Ichiro Suzuki 1996 and No. 5 Tom O’Malley 1993. But O’Malley’s Hanshin Tigers finished fourth that season, and Atsuya Furuta, the catcher for the CL pennant-winning Swallows, was a fairly deserving winner with 32 win shares to O’Malley’s 34.

Here are the WS MVPs and actual MVPs in each league for the past five seasons with the win share totals of league leaders bolded and actual MVPs italicized:

[supsystic-tables id=”15″]