DENVER - Nolan Arenado homered twice, rookie right-hander Tommy Kahnle picked up his first major league victory and Colorado overcame a four-run deficit Saturday night to beat Arizona 9-4 and send the Diamondbacks to their worst start in franchise history.
Charlie Blackmon went 3-for-4, tying the Rockies' franchise record with nine hits in consecutive games, a mark set by Juan Pierre in September 2002. After going 6-for-6 Friday, Blackmon singled his first time up, and then grounded out to first base before adding two more singles.
Paul Goldschmidt had his 26-game hitting streak snapped. He went 0-for-2 with two walks as the Diamondbacks fell to 1-7.
Kahnle (1-0), selected in the 2013 Rule 5 draft from the New York Yankees, pitched 1 2-3 innings of one-hit ball in relief of starter Jorge De La Rosa, who struggled through his second straight start.
Brandon McCarthy (0-1) surrendered six earned runs on seven hits in six innings for Arizona.
The Rockies fell behind 4-0 before scoring three times in the fourth and twice in the fifth to take the lead.
Michael Cuddyer hit a two-run homer, his second, and Arenado followed with his first of the year, a shot that center fielder A.J. Pollock briefly had in his glove before smacking into the wall, which caused the ball to pop out and over the wall, pulling Colorado to 4-3.
Colorado tied it in the fifth when Blackmon singled off McCarthy's glove, stole second and scored on LeMahieu's two-out single down the right-field line. LeMahieu then scored all the way from first on Carlos Gonzalez's single to right field when Gerardo Pena's throw came in to second base and shortstop Chris Owings relayed home with a strike that catcher Chris Montero mishandled as the runner slid across the plate.
Arenado, who entered with a .143 batting average, added a solo shot off McCarthy in the sixth for his first career multi-homer game and also hit an RBI double off Will Harris in the ninth, when he scored on Jordan Pacheco's double.
LeMahieu added a sacrifice fly off Ryan Rowland-Smith in the seventh.
De La Rosa allowed four runs, three of them earned, on four hits. He struggled through a 42-pitch, 21-minute first inning but only gave up one run on Martin Prado's double into the left-field corner that scored Goldschmidt from first. He struck out the first two hitters he faced before reaching full counts on his next four batters, walking Goldschmidt, giving up Prado's double, walking Mark Trumbo and striking out Montero.
The Diamondbacks made it 2-0 in the second on something the Coors Field crowd wasn't accustomed to seeing during Todd Helton's career -- an error on the first baseman. Justin Morneau backpedaled on McCarthy's high hopper and misjudged it, allowing the ball to slip past him and into shallow right field while Owings, who had reached on an infield single, scored from second.
After Prado's infield single in the third, Trumbo homered to right for a 4-0 lead. It was his fourth homer of the season. He now has four home runs and 11 RBIs in five career games at Coors Field.