CHICAGO - Isaac Mattson has been perhaps the most consistent reliever in Don Kelly's bullpen over the past few months. Unfortunately for the Pittsburgh Pirates, the Chicago Cubs were able to force a rare off-day for the right-hander Sunday afternoon at Wrigley Field.

Entering the game with the score tied at three in the bottom of the eighth inning, Chicago rallied to take a 4-3 lead against Mattson, which ended up being the contest's final score. Shortstop Dansby Swanson drove home the game-winning run, plating Carson Kelly on a sacrifice fly to left field.

Caleb Thielbar was the winning pitcher, improving to 3-3. Mattson suffered the loss, dropping to 3-2.

"He's been so good for us, coming in in huge situations," Kelly said of Mattson after the loss. "You look at the first game of the

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