Underwood is rehabbing an undisclosed injury with the Arizona Rookie League Cubs.
He took the mound for one scoreless inning in Arizona on Monday, giving up one hit while striking out two. That marked the first time he has pitched in a game since July 5. It's encouraging to see that Underwood is on the rehab trail, as that means he was not dealing with a serious arm injury, but this has still been close to a lost year for a guy who started the season as the top pitching prospect in the Cubs' system. Prior to the injury he had posted a 4.83 ERA, 1.64 WHIP and 48:31 K:BB in 59.2 innings with Double-A Tennessee. He could be a nice bounce-back candidate in 2017 if he can get healthy, but it is obvious that his stock is much lower than it was at the start of this season.