BOSTON (AP) — Michael Wacha had a funny way of preparing for his World Series start that's supposed to save the season for the St. Louis Cardinals.

The 22-year-old October ace spent Tuesday afternoon on the tarmac at the St. Louis airport when the team plane got grounded by mechanical problems, with no idea when the Cardinals would arrive in Boston, trailing the Red Sox 3-2 going into Game 6 on Wednesday night.

The flight finally took off Tuesday night after a delay of around six hours.

"Everyone is just watching movies," Wacha said from the plane, a couple of hours into the delay. "They've got dinner on here for us and stuff. Everyone is just walking around. Nobody is in a bad mood or anything like that. The attitude is pretty good."

His teammates were probably confident, too, considering what the rookie has done this postseason. He's 4-0 with a 1.00 ERA in four starts, including a win over John Lackey and the Red Sox in Game 2. Lackey will again oppose the tall right-hander.

"I don't think anything will be much different," Wacha said. "I just try to approach every game the same. I don't think it's going to be too much different. We know the next two games are must-wins. It all starts with me tomorrow night."

Wacha has been in these kinds of situations before.

He came within an out of a no-hitter against Washington in his final start of the regular season, only to give up an infield single. With the Cardinals facing a 2-1 deficit in the best-of-five division series, he took a no-hit bid into the eighth inning to win at Pittsburgh.

He twice outpitched Cy Young Award favorite Clayton Kershaw to win Most Valuable Player honors in the National League championship series, then beat Boston with his family in the seats at Fenway Park.

Quite a run, by any standards.

"I think it's been one of those that's been fun for us to watch," Cardinals manager Mike Matheny said from the idle plane. "Taking everything into consideration, how this kid was in school, in college 18 months or so ago, and watch the maturity, and watch the progress, too."

Lackey said he could appreciate what Wacha is going through. The Red Sox righty was a rookie with the Angels in 2002 when he started Game 7 of the World Series and beat the San Francisco Giants.

"Probably similar to the way I was feeling. I think I was 23 or whatever that year," Lackey said. "I don't know what kind of guy he is. But personally, I was more excited about it than anything else as far as nerves."

The Red Sox are trying to clinch a World Series title on their own field for the first time since 1918.