At 24, Johnson will make his first postseason start on Thursday in Game 2 of the National League Division Series against southpaw Mark Mulder, playing right field.
"I'm excited -- this is what I came here for," said Johnson, who batted .213 in 31 games this season but came up big in several important assignments down the stretch. "Being drafted by the Cardinals was a thrill, but to be able to come back and play against them is even better."
In the NL West clincher at PETCO Park against the Giants, Johnson had his first career triple and two other hits, spearheading the attack. He handled the final three outs behind Trevor Hoffman in right field.
Manager Bruce Bochy will have veterans Eric Young in left and Brian Giles in center with Johnson, going with an all-right-handed batting order -- with the exception of Giles -- against Mulder.
Johnson hasn't faced Mulder, the former Oakland A's star, but he can consult with the wily Young for advice. Young is a career .389 hitter against Mulder with three doubles and three walks in 18 at-bats.
"I can't say what it'll be like until we get out there," Johnson said. "The biggest thing for me is to go out and relax. I want to stay controlled, but be aggressive at the same time."
More reflective of his performance than his batting average is Johnson's .467 slugging mark with the Padres. He had eight doubles, a triple and three homers, delivering 13 RBIs. He homered in three consecutive games, starting Aug. 31.
Johnson is not unfamiliar with the Cardinals' personnel. He played with MVP candidate Albert Pujols at Peoria in 2000 before getting dealt to San Diego.
"He just told me he was wondering what took me so long to get here," Johnson said, grinning. "Easy for him to say. Playing together, you always knew he was special. But I didn't know then he was going to be the MVP-type player he is now."
Cool Hand Khalil:
In reflection, Khalil Greene, the Padres' second-year shortstop, felt nothing too unusual about his postseason debut on Tuesday.
Greene lined a double to left against veteran right-hander Cal Eldred to kick-start the three-run ninth that caused pulses to quicken at Busch Stadium after hitting the ball hard to center field his first three at-bats.
Defensively, he mishandled Pujols' grounder for an error in the seventh, but it didn't hurt the Padres. Greene had five assists and two putouts in a busy day with the glove, turning a pair of double plays.
"I'm not one to take into account exterior things," Greene said. "It's all the same once the game starts. You get to the point on the field where don't think about the circumstances, the meaning of the game. You just go out and play and try to make some good things happen."
Mulder's hit list:
When he goes to the mound in Game 2, the Cards' Mulder will be facing some hitters besides leadoff man Young who have given him a hard time in the past.
Third baseman Joe Randa, a former American Leaguer with the Royals, has the most extensive experience against Mulder. Randa is 15-for-40 (.375) with four doubles, two homers and three walks.
Second baseman Mark Loretta is 3-for-5 against the lefty with a double. Xavier Nady, the first baseman, is perfect, having doubled and singled twice against Mulder. Brian Giles is 1-for-4 with two walks, and Greene is 1-for-3.
Lurking on the bench is right-handed Damian Jackson, who is 3-for-7 (.429) against Mulder.
Said Mulder: "I'm prepared whether they put lefties in there or not. Obviously, the more lefties the better for me. But when they throw an all-right-handed lineup out there like some teams do, you can kind of get in a groove with certain pitches. You don't have the different sides of the box."
Veteran right-hander Woody Williams (9-12, 4.85 ERA) gets the call in Game 3 on Saturday at PETCO Park against Cards right-hander Matt Morris (14-10, 4.11 ERA).