<p>PHOENIX &mdash; Dom Nuñez hit a grand slam, Trevor Story had three hits that included a two-run homer and the Colorado Rockies pounded out 18 hits in a 14-6 win over the Arizona Diamondbacks on Saturday night.</p>
<p>It was a good start to May for the Rockies, who had the most losses in the National League during April with a 9-17 record. The top three hitters in Colorado’s lineup all had good nights: Raimel Tapia had four singles and scored two runs, Story added a double to go with his homer and Ryan McMahon had two hits and four RBIs, including the go-ahead, two-run single in the fourth.</p>
<p>Arizona starter Zac Gallen (1-1) needed 93 pitches to get through four innings. He gave up four earned runs on six hits and two walks while striking out seven. </p>
<p>McMahon’s error on a grounder was part of the reason the Diamondbacks scored a pair or runs in the third and pushed ahead 2-1, but the third baseman made up for the miscue the very next inning.</p>
<p>The left-handed McMahon sliced a two-out single to the opposite field, scoring Tapia and Story to give the Rockies a 4-2 lead. The Diamondbacks pulled to 4-3 on Carson Kelly’s RBI single, but Story responded in the sixth with his two-run homer.</p>
<p>Story was out in front of Caleb Smith’s changeup on a 2-2 count, but reached out and pulled the ball down the left-field line. The liner just cleared the wall, landing in the Arizona bullpen.</p>
<p>After Nuñez smacked his eighth-inning grand slam off Matt Peacock to make it 14-5, the Diamondbacks turned to infielder Asdrúbal Cabrera on the mound. Another infielder, Wyatt Mathisen, made his first career pitching appearance in the ninth.</p>
<p>Mathisen threw one pitch that registered 46 mph, but still threw a scoreless inning. Peacock had a particularly rough outing, giving up seven earned runs in one-third of an inning.</p>
<p>Austin Gomber (2-3) gave the Rockies a solid outing, allowing four runs — two earned — over six innings. He permitted five hits and one walk and struck out four.</p>
<p>Andy Young had a pinch-hit solo homer for the Diamondbacks in the sixth, and Kelly brought home a run with a sacrifice fly in the seventh. But every time the Diamondbacks chipped away at the lead, the Rockies responded — and Nuñez’s grand slam ended any suspense.</p>
<p>NEARING 300</p>
<p>Arizona’s fifth-year manager, Torey Lovullo, needs one more win to reach 300 with the team. He’d be the fourth manager in club history to hit the mark: Kirk Gibson (353), Bob Melvin (337) and Bob Brenly (303) are all in the club.</p>
<p>TRAINER’S ROOM</p>
<p>Rockies: Put RHP Antonio Senzatela on the 10-day injured list with a right groin strain. The move is retroactive to Friday. The team called up LHP Lucas Gilbreath from its alternate training site.</p>
<p>UP NEXT</p>
<p>The teams play the finale of their four-game series on Sunday afternoon. The Diamondbacks will send RHP Merrill Kelly (2-2, 6.33 ERA) to the mound to face Colorado RHP Chi Chi González (1-0, 3.60).</p>
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