Kieboom was optioned to Triple-A Fresno on Tuesday, Jamal Collier of MLB.com reports.
The Nationals' top prospect could have potentially stayed up for good if he had hit the ground running, but after hitting .128/.209/.282 with a 37.2 percent strikeout rate in 43 plate appearances, he was a natural candidate to be sent down with Anthony Rendon (elbow) coming off the injured list. Kieboom hit .379/.506/.636 with three home runs in 18 games at Triple-A prior to making his big-league debut.
Kieboom went 0-for-4 in Monday's 5-3 loss to the Brewers.
Kieboom is now off to a 5-for-39 (.128 average) start to his MLB career and has struck out in 37.2 percent of his plate appearances while making four errors in the field. Though Trea Turner (finger) is likely multiple weeks away from returning from the injured list, the 14-20 Nationals may have a tough time justifying letting Kieboom work through his struggles at the plate and on defense for much longer at the big-league level. The Nationals are set to activate Anthony Rendon (hamstring) from the 10-day injured list Tuesday, and there's a real possibility that the team sends Kieboom back to the farm in a corresponding move and reinstalls Wilmer Difo as the primary shortstop until Turner returns.
Kieboom is not in the lineup Thursday against the Cardinals.
Kieboom has gone just 3-for-22 (.136) with a pair of homers and nine strikeouts in six games since earning a promotion near the end of April. As such, he'll take a seat for Thursday's series finale as he looks to hit the reset button. Wilmer Difo is starting at shortstop and hitting eighth in his place.
Kieboom went 2-for-4 with a walk and a solo home run in Sunday's extra-innings win over the Padres.
Over a span of three innings, Juan Soto, Victor Robles and Kieboom -- all 21 years old or younger -- went yard for the Nats, offering opponents a glimpse at what they could be dealing with well into the next decade. Kieboom's now slugged two homers in his first three big-league games, but he's also struck out five times in 12 at-bats. He'll get regular playing time at shortstop until Trea Turner (finger) is back, but if the youngster is still producing at that time, he could stick around at second base, his likely long-term home on the Washington infield.
Kieboom went 1-for-4 with a solo home run in Friday's loss to the Padres.
The rookie was the center of attention in his big-league debut, taking Craig Stammen deep to lead off the eighth inning and tie things up at 3-3 but then striking out with the bases loaded in the ninth against San Diego closer Kirby Yates to end the ballgame. Kieboom was tearing up Triple-A prior to his promotion, hitting .379 with three homers in 18 games, but he struck out 20 times and the 21-year-old could struggle to make consistent contact in the majors at this stage of his development.
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