Barnhart went 3-for-5 with a double and RBI in Friday's 3-2 extra-inning loss to the Nationals.
He plated Adam Duvall with a second-inning single, although Barnhart was then thrown out at second attempting to advance. The 25-year-old has been swinging a hot bat over the last 10 games, hitting safely in eight of those contests, along with four doubles, three RBI and five walks.