Jose Iglesias singled home Nick Senzel in the seventh inning for the Reds’ only run in a 3-1 loss to the Nationals in Washington.
Joey Votto and Jesse Winker each delivered two hits in defeat. Cincinnati had nine hits, but went 2-for-11 with runners in scoring position and stranded eight runners.
Alex Wood allowed three runs over five innings to take the loss.
The Reds have lost four of their last six.