All three of the baserunners Giolito allowed came in the first two innings. But after Gosuke Katoh hit a one-out single in the second, Giolito was perfect. He induced a double play to end the inning and then retired the next 12 batters in order to finish his start in style.
Second baseman Wilmer Difo, the Nationals' No. 20 prospect, scored the lone run of the game in the fourth. He went 2-for-4 and is hitting .305.
With the victory, Giolito improved to 7-2 with a 2.17 ERA. He has struck out 94 and walked 26 in 83 innings.
Giolito hasn't thrown enough innings to qualify for the ERA title in the South Atlantic League, largely because the Nationals have closely monitored his workload since he underwent Tommy John surgery in 2012. If he did qualify, he would lead the league in ERA and WHIP (0.96).
Teddy Cahill is a reporter for MLB.com. Follow him on Twitter at @tedcahill. This story was not subject to the approval of Major League Baseball or its clubs.