(Best E Casino) - Dan Haren will try to keep the Arizona Diamondbacks atop the NL West standings tonight, when he takes the mound in the opener of a three-game series against the San Francisco Giants at AT&T Park.

Haren has won four of his last five decisions and recently pitched seven shutout innings in a win over Los Angeles on Saturday. Haren allowed four hits and struck out seven batters in the 3-2 victory, improving to 9-5 with a 2.58 ERA this season.

The right-hander is 4-4 with a 3.58 earned run average through 10 career games (9 starts) against San Francisco.

Arizona, which is just a game ahead of Los Angeles in the division standings, had a two-game winning streak stopped with Wednesday's 10-6 setback to the Chicago Cubs in the finale of a three-game set. Doug Davis took the loss after he gave up four runs on five hits in seven innings of work. He also struck out six and walked two batters in defeat.

Chris Snyder hit a three-run homer and Tony Clark added a two-run shot for the D'Backs. Stephen Drew extended his hitting streak to 10 games with a double.

San Francisco just swept Washington in three games and posted a 1-0 victory in Thursday's series finale. Matt Cain threw a four-hitter and did not walk a batter in his first shutout since 2006.

Aaron Rowand added two hits for San Francisco, which was swept in three games by Milwaukee coming into the series.

Jonathan Sanchez gets the nod for the Giants tonight. He is 8-5 with a 4.10 earned run average this season, but 0-1 in his last three starts. Sanchez is 1-3 with a 5.48 ERA in seven games (5 starts) against Arizona.

The 2008 season series between Arizona and San Francisco is tied at 4-4.