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Kieboom was called up from Triple-A Fresno on Friday.

It was reported Thursday that Kieboom would receive his first promotion to the big leagues, and the Nationals have made that move official. The 21-year-old was putting up some of the best numbers of his minor-league career at Fresno through 18 games this season with a .379/.506/.636 slash line and three home runs. Kieboom -- Washington's top prospect -- figures to take over at shortstop while Trea Turner remains on the injured list with a broken finger.

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