Jaime Garcia, out. Jake Westbrook, out. Chris Carpenter, still out. And the Cardinals’ rotation rolls on, no matter what Memphian is added.

Lefthander Jon Gast, who features a changeup, has won his first two big-league starts in relief of Westbrook. Lefthander Tyler Lyons, a curveball specialist who made his major league debut Wednesday night in place of the injured Garcia, was even better than Gast.

Lyons, staked to a three-run lead in the first inning, then proceeded to play pitch and catch with All-Star catcher and shepherd Yadier Molina (who also had four hits) as he beat the San Diego Padres 5-3.

Only a seventh-inning, 438-foot homer by Jedd Gyorko (“He got every bit of that,” said Lyons) spoiled Lyons’ maiden voyage. Needing just 81 pitches for seven, Lyons held the Padres to one run and four hits, walking one and striking out four.

Lyons became the first Cardinals rookie starter since Greg Mathews in 1986 to gain the win and allow one run or none while pitching at least seven innings.

Not only did Lyons, who was 2-1 at Memphis, hold the Padres to two singles, a double and a homer, he had a hit of his own, singling to left in the sixth inning. He didn’t allow the Padres to put more than one runner on base in any inning and four of the six runners didn’t reach until there were two out in an inning.

“It was everything I could ask for,” said Lyons, who had the ball from his hit, the lineup card and some tickets given him by traveling secretary C.J. Cherre as mementos.

Molina, who caught Lyons once in spring training, said, “When he stepped on the mound, that composure he had was amazing. He was quiet, the ball was down and we got a lot of ground balls (13 ground-ball outs).”

Not only have Gast and Lyons come from Memphis but earlier righthander Seth Maness, who has been excellent in relief, was promoted from there and righthander Carlos Martinez came from Springfield.

“Amazing,” said Molina. “They make my job easy.”

Many Cardinals fans are aware that righthander Michael Wacha, the crown jewel among pitchers in the system, still is at Memphis. But they might wonder if there are even more young pitchers available.

“We kind of know. . . but we still kind of wonder that, too,” said staff ace Adam Wainwright.

“Tyler was awesome tonight. Attacking hitters. Bottom of the (strike) zone all night.

“Those guys have all been great,” said Wainwright, who said he wasn’t nearly as advanced when he made his major league debut in 2005 with the Cardinals.

“Heck, no,” said Wainwright. “I gave up a three-run bomb my first outing. I was terrible. These guys are confident and have great stuff to go with it. It’s a great mix.”

Manager Mike Matheny, who has four young pitchers he didn’t have at the start of the year, said, “I don’t put any ceiling on these guys.”