PHOENIX (Interstat) — Luis García Jr. homered twice, including a grand slam, and drove in six runs as the Washington Nationals pounded the Arizona Diamondbacks 14-1 on Friday at Chase Field. García opened the scoring with a two-run shot in the first inning and capped a six-run sixth with a grand slam, his seventh home run of the season, to give Washington a 13-1 lead. Jorbit Vivas added three RBIs on a double and a single. Foster Griffin (7-2) earned the win, allowing one run over six innings. Merrill Kelly (5-4) took the loss, surrendering seven earned runs in five innings. The Nationals pounded 16 hits, while Arizona managed six. Tommy Troy and Geraldo Perdomo each had two hits for the Diamondbacks. Washington improved to 32-32, while Arizona fell to 33-30. Attendance was 24,272, and the game lasted 2 hours, 39 minutes. The Nationals continue the series Saturday.