DENVER -- Trailing by two runs in the ninth inning, the youthful Colorado Rockies weren't supposed to have the experience to come through.
Rookie Clint Barmes hit a two-run homer to cap Colorado's four-run ninth inning off Trevor Hoffman, helping the Rockies open the season Monday with a wild, 12-10 victory over the San Diego Padres.
"One of the things we are holding on to inside the clubhouse is that no matter what happens, they are not going to back down," Rockies manager Clint Hurdle said. "We will not be intimidated."
By far the youngest team in the majors, the Rockies started three rookies and two others who made their major-league debuts.
Just about every one of them had an impact.
Ryan Speier got two outs in the ninth to win in his first career appearance. Jeff Baker started the ninth-inning rally and became the fifth Rockies player to homer in his major-league debut. Cory Sullivan made his first career at-bat one to relish, lining a double into the corner in left to get Colorado within 10-9.
And then there was Barmes. Not only did he become the first Rockies rookie to hit a game-ending homer, he finished 4-for-6 with a double, drove in three runs and was steady at shortstop.
"I'm still shaking. That's the biggest rush I've ever felt," Barmes said.
Hitter-friendly Coors Field lived up to its reputation, with a sellout crowd of 47,661 alternating between cheers and groans on an afternoon that included eight homers and 30 hits -- 16 for extra bases.
Trailing 10-8, Colorado's youngsters made sure the fans went home happy.
Baker and Sullivan started things off with consecutive doubles off Hoffman, then Aaron Miles tied it at 10 with his career-high fifth hit, a run-scoring single up the middle. Barmes followed with the climactic blow, lifting a two-run homer to left to bring the Rockies charging from their dugout, the fans to their feet and the Padres feeling numb.
"This is an important win, the first game out of the chute," Hoffman said. "We have to nail that one down would have been huge for this club. That part of it is frustrating."
The Padres gave themselves every chance despite a shaky start by Woody Williams in his San Diego debut.
Xavier Nady hit two homers and had four RBI in his Padres debut, and Brian Giles had a homer and three RBI. Phil Nevin and Ramon Hernandez also homered for San Diego, which had 12 hits and scored five runs in the sixth inning.
As for Williams, he didn't get off to quite the start the Padres had hoped when they lured him from St. Louis in the offseason. He gave up consecutive doubles to Miles and Barmes at the start of the game, then walked Todd Helton and allowed Preston Wilson's three-run homer, which made it 4-0.
Williams gave up two more runs in the third on Baker's first career hit, a two-run homer that put the Rockies up 6-3, then was pulled after giving up consecutive singles in the fourth.
Williams allowed six runs and nine hits in 3 1/3 innings, but it wasn't all that much of a surprise since he was 1-1 with a 12.81 ERA in four previous appearances at Coors.
"Woody just struggled with his command he made too many mistakes in this ballpark, not the place to make mistakes," Padres manager Bruce Bochy said.
Superb in his first year at Coors last season, Rockies starter Joe Kennedy wasn't so fortunate in his second opening-day start.
Giles hit a two-run drive in the third inning that bounded into the crowd off the top of the wall in right, then Nevin hit the next pitch into Colorado's bullpen to cut the Rockies' lead to 4-3.
Nady made it 7-6 in the fifth with a three-run homer that chased Kennedy, who gave up six runs and seven hits in five innings.
Colorado's bullpen wasn't much better, giving up four runs in four innings -- not a good sign from a group that set major-league records for losses and blown saves a year ago.
Not that it mattered with the way Colorado's kids played.
"I think we abided by what Clint tells us: Respect everything, but be in awe of nothing," Sullivan said.