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.

The pitch was fouled off, but Duran struck out Greene to end the game on the following toss, a 102.5 mph heater that set a record as the Phillies’ fastest game-ending strikeout since the pitch tracking era began in 2008, according to MLB’s Sarah Langs. In the same at-bat against Greene, Duran also threw a 102.7 mph fastball.

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 warmup song. Duran overheard him and smiled. A few minutes later, Alec Bohm whistled it as he left the clubhouse.