The Cubs optioned Ballesteros to Triple-A Iowa on Friday, Taylor McGregor of Marquee Sports Network reports.
The 21-year-old was called up Wednesday by Chicago and went 1-for-2 with three-run double that day against Milwaukee, but he'll head back to the minors to make room on the MLB roster for trade deadline acquisition Willi Castro. Ballesteros has a .334/.393/.497 slash line with 26 doubles, nine homers and three steals in 86 games this year at Iowa.