Aroldis Chapman
New York Yankees closer Aroldis Chapman also developed a splitter toward the tail end of his age 32 season. He threw the pitch approximately 12% of the time in April of 2021, generating an 85.7% whiff rate and a -6.7 run value/100 according to baseball savant, instantly becoming one of the most effective pitches in his arsenal and in the major leagues as a whole.