from BA:

"He’s built upon that record with a strong season for Rakuten, which is in first place in the Pacific League. Tanaka has earned attention for his perfect 17-0 record, while his more meaningful numbers—a 1.20 ERA with 130 strikeouts and 22 walks in 158 innings—have also been impressive. His ERA is the lowest in all of NPB, his strikeouts rank second in the PL and his 1.3 walks per nine innings rank second among starting pitchers with at least 50 innings in the PL.

At 6-foot-2, 205 pounds, Tanaka throws a low-90s fastball that can touch 96 mph. Even though Tanaka can reach the mid-90s, his fastball is the pitch that gives some scouts pause because it comes in on a flat plane, making it more hittable than the velocity might suggest. Tanaka has two secondary pitches that have earned grades of 60 or better on the 20-80 scouting scale, including a 70 splitter with late downward action to keep hitters off his fastball. His low- to mid-80s slider is another plus weapon, while he’ll mix in a curveball as well."