Mondesi was sent back to Triple-A Omaha on Sunday, Rustin Dodd of The Kansas City Star reports.
Mondesi was brought up to the big club for a lone contest against the Twins as part of a Sunday doubleheader, in which he went 0-for-3 with a pair of strikeouts. The second baseman had spent the previous month in the minors, where he's fared significantly better (.324 average in 74 at-bats) than his time with Kansas City this season (.103 average in 39 at-bats), so clearly the team feels he needs to get additional reps in on the farm.