Kohei Arihara Has Brought His Unique Pitch Mix to MLB
This recent tweet from Daren Willman caught my eye:
#Rangers Kohei Arihara threw 7! different pitches in the first inning. pic.twitter.com/X86J6NpvFH
— Daren Willman (@darenw) April 20, 2021
Partially it was because I was already intrigued by Kohei Arihara, but the pure absurdity of this fact stands out, too. He threw seven different kinds of pitches in his most recent start against the Angels. Seven! In one inning! The only other player to accomplish this feat in 2020 was Arihara’s countryman Yu Darvish, who coincidently did so in seven different innings last season. Since 2008 (the first season with public PITCHf/x data), there have been 909 instances of a pitcher throwing at least seven different pitch types in a single inning. When you think about how many innings of regular season baseball have been played since 2008, you can appreciate how rare this type of occurrence is.
If you are not familiar with Arihara yet, let me fill you in. The right-hander came over from NPB after playing six years for the Hokkaido Nippon-Ham Fighters. He was posted going into his age-28 season and signed a two-year deal with the Rangers for a total of $7.44 million, $1.24 million of which was the posting fee awarded to his now-former club. At the time of signing, this seemed to be a very good deal for Texas. Arihara lacks the explosive fastball and mind-bending breaking pitches frontline starters in MLB today; his strikeout rate his final season in Japan was 19.4%. But his repertoire was deep. Eric Longenhagen wrote up a scouting report back in December outlining his pitch mix and fastball velocity, comparing him to other high-profile players from NPB. Eric concluded that Arihara profiled as a back-of-the-rotation type, placing a 40 FV on him. Getting a guy who can fill the back of a rotation for about $3.7 million per year (when accounting for the posting fee) seems like a solid deal to me. Read the rest of this entry »