The Nationals selected Kieboom with the first of their back-to-back picks in the first round in 2016, four years after the organization had drafted his elder brother, Spencer, a catcher, in the fifth round. Regarded by scouts as one of the better prep hitters in his class, Carter, who signed for below slot at $2 million, has steadily built upon that reputation as a pro. After being limited by a hamstring injury in what was still a productive first full season, a healthy Kieboom broke out in 2018, earning a midseason promotion to Double-A at age 20 as well as an All-Star Futures Game selection after a torrid first half in the Carolina League. He took home the Nationals Minor League Player of the Year award after ranking among the organization's Minor League leaders with 48 extra-base hits (tied for first), 16 home runs (third) and 69 RBIs (second).
Kieboom impresses scouts with plus bat speed and loose wrists as part of a balanced right-handed swing. He's comfortable hitting to all fields, with plus raw power to his pull side that should play more from line to line as he gets stronger. He did a better job in 2018 of striking balance in his approach and consistently put together strong at-bats. While not a basestealing threat, Kieboom does have average speed, which plays up thanks to his quick feet and excellent instincts.
Kieboom has worked hard to improve his defense as a pro and projects to be at least average, with the necessary range, hands and arm strength to profile elsewhere on the infield if forced off shortstop. A move to second base, where he saw reps during the Arizona Fall League, is a possibility.
Statcast - Batting
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Washington Nationals optioned SS Carter Kieboom to Fresno Grizzlies.
Washington Nationals selected the contract of SS Carter Kieboom from Fresno Grizzlies.
SS Carter Kieboom assigned to Fresno Grizzlies from Harrisburg Senators.
Washington Nationals invited non-roster SS Carter Kieboom to spring training.
SS Carter Kieboom assigned to Harrisburg Senators from Potomac Nationals.
SS Carter Kieboom assigned to Potomac Nationals from Hagerstown Suns.
IF Carter Kieboom assigned to Washington Nationals.
SS Carter Kieboom assigned to Hagerstown Suns from Auburn Doubledays.
Hagerstown Suns sent SS Carter Kieboom on a rehab assignment to Auburn Doubledays.
Hagerstown Suns sent 2B Carter Kieboom on a rehab assignment to GCL Nationals.
Hagerstown Suns placed SS Carter Kieboom on the 7-day disabled list.
SS Carter Kieboom assigned to Hagerstown Suns from GCL Nationals.