Chicago Cubs starting pitcher Cade Horton exited with a blister on his right middle finger in the third inning of a 7-0 loss to the Milwaukee Brewers on Monday

CHICAGO — Three innings into Monday’s scheduled doubleheader at Wrigley Field, Chicago Cubs starter Cade Horton walked off the mound with a blister on his right middle finger, an issue that will put even more stress on a pitching staff that has kept the club afloat.