WASHINGTON - Carter Kieboom calmly watched ball four then strolled to first base, where he did a fist bump with coach Bob Henley.
The subtle bases-loaded walk by Kieboom, 22, that brought in a run in the fifth inning Sunday against the Marlins was lost in an inning that included another hit by Luis García and a two-run triple by Trea Turner.
But the maturation of third baseman Kieboom - who made his Major League debut last season - continues out of the limelight with García making his debut on the infield this month while the Nationals deal with injuries to established stars such as Stephen Strasburg and Starlin Castro.