Duran discovered the signature pitch by accident during a bullpen session in 2018. This season, he’s thrown the pitch nearly 40% of the time and is holding opponents to a .221 average.

It was 30 minutes after Duran left the mound, and the Phillies readied to head home. Taijuan Walker sat at his locker and whistled Duran’s warm-up song. Duran overheard him and smiled. A few minutes later, Alec Bohm whistled it as he left the clubhouse.