WASHINGTON -- DJ LeMahieu collected three hits, including a home run, and Corey Dickerson doubled in his first two major league at bats as the Colorado Rockies beat the Washington Nationals, 7-1, on Saturday.
The Rockies (38-38) broke a five-game losing streak, scoring three runs in the first inning and three more in the fourth against Dan Haren (4-9).
Nolan Arenado also hit a home run for the Rockies, a solo shot that made it 7-0 in the eighth.
The Nationals (37-37) had only five hits and no runs in seven innings against Colorado starter Jhoulys Chacin (6-3), who took a shutout into the ninth inning in his previous start against the Phillies.
Washington had its three-game winning streak come to an end.
Matt Belisle came on to pitch a scoreless eighth for the Rockies, who had hits from everyone in the starting lineup, and Wilton Lopez came on in the ninth and gave up a solo home run to Ryan Zimmerman before nailing down the win.
Colorado added to its lead in the fourth when Wilin Rosario led off with a single and took third on a double by rookie Dickerson. Rosario scored on a wild pitch by Haren to make it 4-0 and pitcher Chacin singled home Dickerson.
That was the end of the day for Haren, who was replaced by Ross Ohlendorf. LeMahieu singled in a run against Ohlendorf to make it 6-0, although the run was charged to Haren.
The Rockies scored three in the first on a solo home run by LeMahieu, a run-scoring single by Virginia native Michael Cuddyer and an RBI double by Dickerson in his first at bat in the majors.
The hit by Cuddyer extended his career-high hitting streak to 20 games as he reached base for the 39th game in a row.
The home run by LeMahieu was the 19th allowed this season by Haren, who leads the majors in that category. It was the first home run of the season in 103 at bats for LeMahieu.
Haren allowed six runs and seven hits with five strikeouts and no walks in 3 1/3 innings. Washington manager Davey Johnson said before the game Haren sometimes overthrows.
"That is when he gets in trouble," Johnson said.
Princeton product Ohlendorf, a possible replacement in the rotation with an old-time windup, allowed one earned run in 4 2/3 innings out of the bullpen for the Nationals.
NOTES: Corey Dickerson was called up Friday from Triple-A Colorado Springs, where he hit .563 in his last 13 games before coming to Washington. The Mississippi native was hitting .386 with an OPS of 1.075 at Colorado Springs. He was teammate of second baseman Anthony Rendon in the Arizona Fall League and is played for the same Mississippi community college, Meridian, as outfielder Tyler Moore, who began the year with the Nationals and is now at Triple-A Syracuse. ... Washington right fielder Jayson Werth was not in the starting lineup, as Roger Bernadina got the start in right field. Werth was hitless in seven at-bats in the first two games of the series, with five strikeouts. He came off the disabled list June 4 after recovering from a right hamstring injury. ... Ian Desmond of Washington began the day with 32 extra-base hits, the most of any shortstop, and he led shortstops with nine game-winning RBIs. Nine of his 12 home runs this year put the Nationals ahead. He hit a home run in his third game in a row on Friday to give Washington a 2-1 victory. ... The early 12:05 p.m. start was to accommodate the annual Dream Gala for the Nationals, as the team raises money for worthy causes.