Kieboom went 5-for-7 with a double, three home runs, four runs scored and five RBI in Low-A Hagerstown's 22-4 rout of Lexington on Sunday.
On the same day the major-league squad was crushing the Mets, its Low-A affiliate was setting a new Sally League record by banging out 30 hits in a game, with Kieboom leading the way. The Nats' No. 5 prospect is hitting an impressive .333/.413/.580 through 21 games for Hagerstown, and the 19-year-old may not be long for the level if he keeps raking. Kieboom's ability to hit for power was the biggest question mark in his profile when he was drafted, but so far in 2017 he seems to be putting those doubts to rest.