And it was the focus on that, on winning an important playoff game, that allowed Halladay to wave off the building pressure of his no-hit, no-run performance. He even drove in one of the Phillies' runs with a hit.
"It's something I wasn't real worried about achieving," Halladay said of the no-hitter. "I think if you're not putting too much emphasis on trying to throw a no-hitter, you're going out and staying aggressive. It makes it a lot easier."
His teammates and the sellout crowd at Citizens Bank Park were feeling the pressure for him. As the game wore on - as the number of outs remaining dwindled to nine, then six, then three - the Phillies' dugout grew quieter while the frenzied towel-waving fans grew louder and more excited.
"About the sixth inning, it got real quiet," Phillies manager Charlie Manuel said. "People stayed in their seats and sat there and watched the game. [Halladay] came in and went down to the end of the dugout, sat in his chair, and didn't say a word. End of the inning, he'd get back up and go back on the field. It's pretty neat, really."
Out in the bullpen, the relief pitchers also stayed put. No one wants to change the energy or put a jinx on a pitcher with a no-hitter. One reliever needed to relieve himself, but Ryan Madson said he had remained in place until Halladay secured the final out.
The Phillies are in the postseason for the fourth consecutive October, and the ballpark had been louder only a handful of times before: when Brad Lidge got the final out of the 2008 World Series and after a couple of other series-clinching wins.
The quiet of his teammates didn't pierce Halladay's otherworldly focus. The sonic boom of the fans did.
"When it gets that loud," he said, "it's hard to ignore. I thought especially the last three innings, it seemed like it got louder every inning. It was a lot of fun."
The day started normally enough. Halladay got to the ballpark at his usual time. He said he had tried to treat his first postseason start as a normal workday, to "disconnect yourself from the emotions a little bit." Shortstop Jimmy Rollins, who usually says a few words to Halladay, decided not to before this game.
"I said, 'Roy looks like he's in a different world right now,' " Rollins said.
What a world it turned out to be. Halladay was so good, so nearly mechanical, that there was little of the usual drama that surrounds a no-hitter. He issued his only walk in the fifth inning to Reds outfielder Jay Bruce. The only truly hard-hit ball, a line drive off the bat of relief pitcher Travis Wood, was caught by rightfielder Jayson Werth.
Rollins made two solid plays, making one throw from deep in the hole at short and scooping up a ball that ticked off the mound and changed its angle.
But Halladay was the story. He got through the heart of the Reds' lineup in the seventh, then got three outs, including two strikeouts, on just seven pitches in the eighth inning. When he came out for the ninth, the crowd was on its feet, rally towels fluttering. With each out, the stadium shook.
Ramon Hernandez popped out to Chase Utley. Miguel Cairo hit a foul pop-up toward the third-base side. Wilson Valdez drifted under it and caught it with two hands, as if it were a baby dropped from a burning building. That brought up Brandon Phillips, the Reds' speedy leadoff hitter.
Phillips hit a ball that traveled no farther than his bat. Catcher Carlos Ruiz made the best defensive play of the night, ending the game and the suspense by throwing Phillips out from his knees.
Ruiz rushed out to hug Halladay. Ryan Howard, who caught the final outs of both of Halladay's 2010 classics, stretched his big arms and embraced them both. Soon the rest of the team was celebrating near the mound.
A fan held up a sign, "Welcome to Doctober." Halladay's wife and kids celebrated in the stands. Fireworks filled the South Philly sky.
Roy Halladay, one of the greatest pitchers never to have pitched in the postseason, had delivered one of the greatest postseason pitching performances ever.
"You want to share things like this with family and friends," Halladay said. "My family's here, and I feel like my friends are on the team."
He made a few million more friends Wednesday night.
Contact columnist Phil Sheridan at 215-854-2844 or email@example.com. Read his recent work at http://go.philly.com/