Alberto Gonzalez and Elijah Dukes each had two hits and three RBI for the Nationals, who led 10-1 after four innings. Dunn led off the second with his 31st homer, walked twice and scored two runs.
J.D. Martin (2-2) cruised to his second consecutive win in his sixth career start, allowing an unearned run and six hits over six innings. The rookie right-hander was 0-2 with a 7.16 ERA before he pitched five solid innings against Arizona last Sunday.