Brian Duensing, to be charitable, has had a bad run lately. In June, he posted a 17.28 ERA and 3.000 (!) WHIP with nine walks in eight innings.

He's getting some time off:

#Cubs place Brian Duensing on DL with left shoulder fatigue. Dillon Maples called up — Carrie Muskat (@CarrieMuskat) July 1, 2018

Dillon Maples has had some big league success, and in his last stint with the Cubs, last week against the Dodgers, he threw two scoreless innings and struck out three. He did walk two, and walks have always been his issue.

But Maples throws hard and if he can harness his command, he can be a successful reliever at the big league level.