By MATT BECKER
(AP) -- Arizona's Ian Kennedy made a minor tweak to his delivery prior to his last start. The result: his first victory in more than a month.
Kennedy tries to carry the success from that outing into a start against the suddenly surging Colorado Rockies on Tuesday night and help the Diamondbacks earn a rare home victory.
After enjoying a career year in 2011, going 21-4 with a 2.88 ERA and 198 strikeouts to help Arizona (25-30) win the NL West, Kennedy (4-5, 4.26 ERA) opened this season by winning his first three decisions. He hit a rough patch in May, but snapped a career-worst five-start losing streak Wednesday with a 4-1 victory over San Francisco.
"It's been a while since I've been standing in that line with the high-fives at the end of the game," said Kennedy, who allowed one run and five hits while striking out seven in a season-best 7 2-3 innings.
The right-hander, who threw a career-high 122 pitches, credited some of his success against the Giants to a change in his delivery that helped him stay more on top of the ball. He'll use that approach to face a Rockies team he went 1-0 with a 2.70 ERA against in three outings last season.
Colorado (24-30), however, is on an offensive tear.
The Rockies had 12 hits while winning Monday's series opener 4-0, and have totaled 62 runs and batted .335 while winning seven of their last eight to pull within one-half game of Arizona for third in the West.
Wilin Rosario and Dexter Fowler have been leading the charge.
Rosario had a solo home run and an RBI single Monday, and is batting .346 with three homers and nine RBIs during a seven-game hitting streak.
Fowler tripled and scored in the series opener, extending his career-best hitting streak to nine games. He is batting .531 with three homers, three triples, nine RBIs and 15 runs scored during his run, and is 5 for 17 (.294) with a double and triple lifetime against Kennedy.
Colorado snapped a five-game losing streak at Chase Field on Monday, becoming merely the latest visitor to frustrate Arizona on its home field.
The Diamondbacks opened the season with four straight home victories, but are 6-16 there since. Arizona managed six hits Monday, as Willie Bloomquist, Justin Upton, Chris Young and Jason Kubel went a combined 0 for 14 with two walks. Upton is batting .143 with eight strikeouts in his last seven games.
"We weren't able to swing the bats at all," manager Kirk Gibson said. "It has been a trend. You got to score runs. We didn't score any runs. You are never going to win if you don't score."
The offense will try for better luck against Rockies starter Jeremy Guthrie (3-3, 5.48), who makes his first career appearance against the Diamondbacks.
Guthrie has been knocked around for 17 runs and 29 hits in 18 innings over his last three outings. The right-hander permitted five runs and a career high-tying 12 hits in seven innings against Houston on Thursday, but Colorado's offense bailed him out with 11 runs of support as he got credit for an 11-5 win.
Updated June 5, 2012