PHOENIX - Randall Delgado tried almost too hard to make Arizona's rotation in spring training, tossing out mechanics as he overthrew.
A stint in the minors did wonders for the young right-hander, giving him the strike-throwing foundation that has allowed him to pitch so well since being called up.
Pounding the strike zone with his fastball and getting San Diego's hitters to chase his changeup, Delgado tossed a three-hitter for his first career shutout, and the Diamondbacks pounded out 17 hits in a 10-0 rout over the Padres on Friday night to stay a half-game behind the first-place Dodgers in the NL West.
"This is what he's been building up toward," Diamondbacks manager Kirk Gibson said.
The Diamondbacks gave Delgado plenty of support, roughing up Eric Stults (8-9) with six runs in the first three innings and seven extra-base hits.
Aaron Hill had a pair of run-scoring doubles before leaving with a tight right hamstring, A.J. Pollock added a two-run single, and Martin Prado had two of Arizona's six doubles.
Delgado (3-3) helped himself by adding a pair of singles, becoming the first Arizona pitcher with a shutout and a multihit game since Randy Johnson on Sept. 14, 2003, against Colorado.
"I thought he pitched really well tonight," Padres third baseman Chase Headley said. "They beat us in every aspect tonight, and sometimes that happens."
One of the top pitching prospects in baseball, Delgado arrived in Arizona with Prado last year in a six-player deal that sent outfielder Justin Upton and infielder Chris Johnson to Atlanta.
Delgado failed to make Arizona's rotation out of spring training and opened the season at Triple-A Reno, where he worked on his mechanics and his strike-throwing mentality.
Since being called up in June, the 23-year-old Panamanian has been a solid addition to Arizona's staff, allowing three earned runs or fewer in all eight starts.
Delgado worked 5 2/3 scoreless innings in his previous start, a 3-1 win over San Francisco, and was even better against the Padres.
Everth Cabrera lined his first pitch of the game for a single, but the right-hander retired nine straight until Headley's leadoff double in the fourth. Delgado stranded him at second and retired 10 straight before walking Yonder Alonso with one out in the seventh.
Right fielder Gerardo Parra made a spectacular catch against the fence to rob Will Venable of a hit to end the seventh, and shortstop Didi Gregorious made a diving grab for the game's final out, helping Delgado extend his scoreless streak to 14 2/3 innings.
Delgado struck out three, walked one and threw 70 strikes in 100 pitches for his first career complete game.
"This is a key for the pitchers, throw a lot of strikes, try to be ahead in the count," Delgado said. "That helped so much today. I was just trying to keep the ball down, throw a strike and see what happens after that."
Stults pitched well his previous three starts, allowing five earned runs in 21 innings, and tossed a two-hit shutout his last start against Arizona on June 14.
The Diamondbacks roughed up the left-hander right away Friday. Hill drove in a run with a double in the first inning, then scored on Prado's run-scoring single.
In the second inning, Cliff Pennington scored from first when Todd Hundley, San Diego's catcher, threw wildly to first on Delgado's sacrifice bunt, and Hill followed with a second RBI double before leaving for precautionary reasons.
The D-backs scored two runs in the third inning, on Wil Nieves' run-scoring single through a drawn-in infield and an RBI double by Pennington that made it 6-0.
Ross added a run-scoring single in the fourth inning off Stults, who allowed seven runs - five earned - on 11 hits and struck out five.
"I didn't give us a chance to win from the start," said Stults, winless his last five road starts. "The first inning to give them the two runs, then in the second inning to not come out and give us a shut-down inning, that was tough."
Ross led off the seventh inning by hitting Colt Hynes' up-in-the-zone 0-2 pitch off the foul pole in left for his sixth homer, and Pollock made it 10-0 with his two-run single.
By then, Delgado was already rolling to his best outing in the majors.
• Arizona catcher Miguel Montero missed his fourth straight game with a stiff back and is still day-to-day.
• Alonzo went 0 for 3 to end an 11-game hitting streak at Chase Field, second-longest by a Padres player at Arizona's home field.
• Arizona lefty Tyler Skaggs, who will start today against San Diego, is 0-1 and has allowed nine earned runs in eight innings in two career starts against the Padres.
• What: Padres at Diamondbacks
• When: 5:10 p.m.
• TV; radio: FSAZ; 1490-AM, 104.9-FM