Extra bases

• Cubs pitcher Jake Arrieta will make a rehab start on Saturday for Double-A Tennessee in the Smokies' game against Pensacola. Arrieta was slowed this spring because of tightness in his right shoulder, and he threw a side session on Wednesday at PNC Park and said it went well.

There is no time table for his return. He will likely need at least two starts at Triple-A Iowa as well.

• Outfielder Justin Ruggiano, sidelined Monday to give a sore left ankle more time to heal, said Wednesday he was ready to go. Ruggiano was not in the starting lineup, but he may start Thursday against Pirates lefty Wandy Rodriguez.

Carrie Muskat is a reporter for MLB.com. She writes a blog, Muskat Ramblings, and you can follow her on Twitter @CarrieMuskat. This story was not subject to the approval of Major League Baseball or its clubs.