The split-fingered fastball is the "it" pitch right now, but it is still rarely thrown by left-handed pitchers. Why is that?

LOS ANGELES — The New York Yankees can have their torpedo bats. The Dodgers have the splitter. In baseball’s ever-adapting laboratory of trends, the hunt always is on for the next best thing.

TORONTO(AP) — Mr. Splitty has returned. Showcased by World Series Game 6 starters Kevin Gausman and Yoshinobu Yamamoto, split-finger fastballs have been used for 6.8% of postseason pitches this year, ...