White Sox closer David Robertson learned the cutter from one of baseball's best practitioners of the pitch--Mariano Rivera.
Robertson is now passing on that knowledge to Chicago bullpen-mate Zach Putnam.
"I'm trying to have him impart some of that knowledge on to me as I develop that pitch as a third pitch," Putnam said, per MLB.com. "It was almost surreal listening to him talk yesterday. He was like, 'Mo holds his like this and does this with it,' and I'm like, 'I wish I had a camera to record all this so I have it for future reference.' But I'm trying to learn from him whenever I can."