DENVER -- The Colorado Rockies tore into Edinson Volquez once again on Friday night, driving the San Diego Padres starter from the game in the third inning and building a six-run lead.
It was barely enough as the Rockies eked out a 10-9 victory when rookie Nolan Arenado led off the ninth with a home run against Joe Thatcher. It was the Rockies' first walk-off home run this season and Arenado's fifth homer of the year.
Arenado tossed his helmet in the air as he rounded third base and headed toward his happy teammates, waiting to greet him at home plate.
"There's nothing better than hitting a walk-off," said Arenado, who also made two terrific defensive plays at third base. "I hit a couple in the minor leagues, and they're the funnest thing. But doing it up here is obviously real special."
Starter Jorge De La Rosa gave up four runs as he wobbled through five innings for the Rockies, and the Padres tied the score at 9 when they teed off on Rob Scahill in the seventh for five runs.
Volquez, who gave up career highs in hits (11) and runs (9) in 2 1/3 innings, has a 14.66 ERA in three starts against the Rockies this season, having allowed 26 hits and 20 runs (19 earned) in 11 2/3 innings.
But Scahill's calamitous outing took Volguez off the hook.
On the other side, De La Rosa gave up 11 hits, tying his season high, and he struggled with his command.
"I tried to keep the ball down, when I try to throw a strike," De La Rosa said. "I leave it up and I pay for it. "
In the seventh, Scahill, Scahill hit leadoff batter Chase Headley with a pitch. Carlos Quentin and Jedd Gyroko hit back-to-back home runs to cut the Rockies' lead to 9-7. Kyle Blanks lined a double to left and scored on Cameron Maybin's single that finished Scahill.
Josh Outman came on and sandwiched an out between walks to two of the first three batters he faced, loading the bases. Everth Cabrera hit a slow roller to second and beat DJ LeMahieu's throw for a tying single. Outman struck out Headley and gave way to Wilton Lopez. He yielded a hot shot to Quentin that Arenado backhanded at third and threw him out.
"It's always tough to lose," Padres manager Bud Black said, "but the way we came back is the thing we need to feel good about. These guys don't melt when things aren't going there way."
Carlos Gonzalez drove in three runs with two triples but left the game with soreness in his left knee when Outman relieved Scahill.
"I twisted my ankle," he said. 'I tried to avoid my ankle and put my whole weight to the knee...But I feel fine."
Todd Helton had his first three-RBI game of the season for the Rockies, who did most of their damage against Volquez with two outs in the second, when they erupted for five runs to go ahead 8-2.
Gonzalez, the first of six straight batters to reach base, tripled home two runs. After Volquez hit Troy Tulowitzki in the upper portion of his back with his next pitch -- home plate umpire Ed Hickox issued a warning to both sides -- Helton, who doubled home two runs in the first, lined a run-scoring single to center.
Arenado flared a run-scoring single to right center and DJ LeMahieu walked to load the bases. Yorvit Torrealba hit a slow roller that Headley charged at third, but Torrealba beat his throw.
De La Rosa yielded a two-run homer to Kyle Blanks in the second, the fifth homer of the season for Blanks and the first homer allowed by De La Rosa in 41 1/3 innings since he surrendered one to Hanley Ramirez on April 30 at Los Angeles.
De La Rosa gave up a run-scoring single to Quentin with two outs in the third to make the score 8-3 but struck out Blanks with runners on second and third to end the inning.
The Padres put runners on first and second for Blanks with two outs in the fifth, and he singled home a run to make it 9-4. Arenado saved a run by diving to his left for Maybin's hard smash and throwing him out to end the inning.
The home run Arenado hit was the first allowed this season by Thatcher, who has pitched 17 1/3 innings in 30 games.
"It was a fastball," Thatcher said of his 1-1 pitch. "Tried to get it to the outer half. It backed up. He didn't miss. Tonight was his night. He made great plays defensively, then... "
Thatcher trailed off. There was no need to state the obvious.
NOTES: Padres 1B Yonder Alonso was diagnosed with a broken third metacarpal on his right hand and will be out four or more weeks. He was placed on the 15-day disabled list Thursday retroactive to May 31 with a right hand contusion, but a CT scan revealed a broken bone above the knuckle of his middle finger. In his absence, Blanks and Jesus Guzman will play first base with Mark Kotsay able to fill in there as well. ... Padres 3B Headley left the game with tightness in his right calf as part of a double switch in the seventh ...IF Jonathan Herrera made his first professional appearance in the outfield when he replaced Gonzalez in left field in the seventh... LHP Jeff Francis (left groin strain) will be activated Saturday and make his first start since May 14, pitching in place of RHP Tyler Chatwood, who strained his right triceps Monday in a four-inning start at Cincinnati. ... Chatwood is scheduled to throw a light bullpen session on Saturday. The Rockies are eyeing a June 15 return for him, which is why he has not been placed on the 15-day disabled list. ... Fowler was back in the lineup after not playing Thursday due to a migraine headache that he said was his first. Fowler, who received an injection in his stomach on Thursday to relieve his symptoms and a CAT scan that came back clean, said, "I still got a little headache, but I'm fine." ... Helton's double was the 574th of his career, tying him for 20th all-time with Hall of Famer Charlie Gehringer... Colorado RHP Rafael Betancourt (right groin strain) is eligible to be activated June 16 but said it could be the end of June at the earliest before he returns. Betancourt received an injection on Monday and another Friday. ... De La Rosa was 0-for-19 this season when he singled in the second.