Harper went 2-for-4 with a walk, a home run, two runs scored and two RBI in Tuesday's win over the Pirates.
PNC Park was the last remaining National League park Harper had never homered in coming into this series, but the 24-year-old scratched it off his list with a no-doubt blast off Wade LeBlanc in the ninth inning, his 13th long ball of the season and fourth in the last seven games.