"It was a long game," Cubs manager Rick Renteria said. "We're in a situation where [Baker] has been handling Hammel, and it worked out where he can do the same thing again today."
Baker's offense is a downgrade from Castillo, who is hitting .250 (25-for-100), and whose four homers and 15 RBIs are nearly halfway to his 2013 totals of eight and 32.
Entering Friday, Baker was batting .080 (2-for-25) with two walks and 11 strikeouts in 2014.
Joe Morgan is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.