Jake Diekman is a Major League Baseball pitcher who currently pitches for the Oakland As and got his J Pouch a few years ago when he was pitching for the Texas Rangers. Here is his story:
https://www.google.com/amp/s/s...field-151320344.html
He was a highly effective relief pitcher for the Oakland As with his J Pouch, with ERA of 0.42, WHIP under 1 and 8 hits in 21.2 innings in the Covid shortened 2020 baseball season.