Parker allowed two runs on four hits and two walks while striking out three over five innings in a no-decision versus the Diamondbacks.
Parker was unlucky to take the loss, as the Nationals had an 8-2 lead when he was relieved by Jacob Barnes. This was an improvement for Parker, who had given up at least five runs in three of his four previous starts. The southpaw is now at a 4.31 ERA, 1.21 WHIP and 84:26 K:BB through 100.1 innings over 19 starts. He'll look to snap a seven-start winless skid in his next outing, which is projected to come at home versus the Brewers this weekend.