CHICAGO -- The rest on Saturday for Chicago Cubs rookie outfielder Brett Jackson had more to do with a soreness than it did his recent struggles.

While chasing a wind-blown popup in Friday’s game, both Jackson and Starlin Castro dove for a ball in shallow left-center field with Castro landing on Jackson’s neck and right shoulder area. Jackson stayed in the game but felt the effects Saturday.

“He felt like he got hit by a truck more than anything, more of a whiplash type of effect with that collision in center field,” manager Dale Sveum said.

David DeJesus was back in center field with Bryan LaHair getting the start in right field.

Jackson has had a rough start to his major league career. He had two hits in his debut game Sunday at Los Angeles, but starting with his last at-bat in that game, he went on to strike out in eight consecutive at-bats.

Jackson still has just two hits in 17 at-bats (.118) with 11 strikeouts.