In 13 games with Iowa, Stewart was 4-for-44 (.091) with one double and four RBIs. He's struck out 16 times and walked eight times.
So far, Cubs third basemen Luis Valbuena and Cody Ransom have combined for seven home runs in 28 games, most in the Major Leagues. That's also more than half of the entire season total from last season. Valbuena has hit five home runs so far and Ransom has two while playing third. In 2012, Chicago third basemen combined for 12 home runs.
"Right now, that combination is one of the best in baseball at that position," Cubs manager Dale Sveum said Friday. "There's nothing you need to change there."
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.