Lopez (5-4) struck out seven and gave up two runs on three hits and three walks over 5.1 innings in a 7-3 win over the Nationals on Saturday.
Lopez fired 100 pitches (60 for strikes) and worked out of multiple jams to earn his second consecutive win. The 24-year-old lowered his season ERA to 3.96 through 10 starts. He is next scheduled to take the mound Thursday against Atlanta.