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Tanaka should be a hot name in the baseball world, and I expect, given the season that Yu Darvish is having, that he will be soon.
In 2005, he broke Daisuke Matsuzaka's high school record for strikeouts. While that doesn't exactly lend itself to excellence in the majors, as Matsuzaka was supposed to practically revolutionize the way people pitched when he came over, it still gives you an insight into how talented this guy is.
In 2011, Tanaka went 19-5 with a 1.27 ERA, 241 strikeouts, 171 hits and only 27 walks in 226.1 innings pitched. While I would love to file that under the same "scary" headline as Abreu's season, it is worth noting that the league he plays in switched balls prior to the season, which led to offensive declines.
It is also worth noting that Tanaka had a better ERA than Darvish in 2011 and was second to him in innings pitched, strikeouts and WHIP. He finished second in MVP voting for the Pacific League.
He throws a fastball that tops out at 96 mph (though it is generally in the low 90s), a slider and a splitter.
If Darvish can continue his success and Daisuke can recover from his injuries and prove to be effective again, look for Tanaka to garner a lot of attention from major league clubs.