Houston's Colby Rasmus hit the first pitch he saw Tuesday night deep into the right-field bleachers.
The leadoff homer in the second inning was all that Dallas Keuchel needed as the Astros beat the New York Yankees 3-0 in the American League wild-card game.
Rasmus hit his homer off New York starter Masahiro Tanaka. Carlos Gomez added a solo shot later in the game for a 2-0 lead.
Rasmus has been on a tear of late, having homered in each of Houston's final three regular-season games to finish with 25.
With the win, the Astros advance to the ALDS where they will play Kansas City, the team that finished with the best record in the AL.
That series will start Thursday night at 7:30 p.m.
"Now we get to go to Kansas City. It's going to be some grind-it-out baseball," Rasmus said. "We have to come in there the way we came in tonight. It's going to be fun."
Pitching on three days' rest for the first time in his career, Keuchel baffled New York for six innings of three-hit ball.
"To come to Yankee Stadium and play that well was truly remarkable," said Keuchel, the AL's only 20-game winner.
Aggressive from the start in their initial playoff appearance as an American League club — and first since being swept by the White Sox in the 2005 World Series — the Astros came out swinging against Masahiro Tanaka in front of a revved-up Yankee Stadium crowd.
Rasmus and Gomez's homers helped Keuchel settle down.
"That really settled me down, and that's who we are," Keuchel said. "We hit a lot of home runs, pitch well and play defense."
AL hits leader Jose Altuve had an RBI single off All-Star reliever Dellin Betances in the seventh.
Reliever Tony Sipp walked one, and Will Harris and Luke Gregerson were each perfect for an inning to finish the three-hitter. The boos from the 50,113 stunned fans in the crowd grew with each out as Gregerson closed for a save.
The Astros raced to an area between first and second after Brian McCann grounded out to end it and jumped up and down in a big scrum. As he was coming off the field, Keuchel pumped his fists toward a group of cheering Astros supporters in orange shirts — and a few in big black beards — behind the visiting dugout.
It was a celebration a few years in the making. The Astros had averaged 104 losses in their previous four seasons.
In a matchup of two teams that surprised many by building big division leads before wasting them late, the upstart Astros, just two years removed from a 111-loss season, looked the more comfortable team in the October limelight.
They clowned around during pregame introductions, then stayed loose the whole game.
The Yankees lost six of seven to close the regular season. And despite all the talk of a playoff reset for the struggling lineup, they went bust against a new nemesis in their first — and only — postseason game of the post-Derek Jeter era.
"Just didn't get it done," manager Joe Girardi said.
Fans taunted the 27-year-old Keuchel the moment he walked to the outfield for warmups. Then he toyed with the Yankees from the first batter, striking out Brett Gardner looking.
"I felt like I had never been on the mound before with the adrenaline I had," Keuchel said.
Gardner, Brian McCann, Chris Young and Girardi all had words with plate umpire Eric Cooper as Keuchel cruised through New York's lineup for the third time this season.
The AL Cy Young Award contender held the Yankees scoreless for 16 innings in two regular-season starts. On this much bigger stage, the lefty was just as confounding, dropping his slider and two-seam fastball seemingly wherever he wanted in striking out seven as nearly all his teammates and coaches stood along the dugout railing for every pitch.
When he gave up two singles in the sixth — bringing the crowd to its feet with Alex Rodriguez stepping into the batter's box — manager A.J. Hinch took a walk to the mound to give Keuchel a breather. Keuchel responded by getting A-Rod to fly out lazily to center field for his final out.
Keuchel is the first starter with a scoreless postseason start on three days' rest since Josh Beckett pitched a shutout for the Marlins at Yankee Stadium in the clinching Game 6 of the 2003 World Series.
Tanaka struggled with the long ball all season, giving up 25 homers in 24 starts this year. He only allowed two more hits in five innings but matched a season high with three walks. He struck out three.
ACE IN THE BOOTH
Tampa Rays right-hander Chris Archer has a new October gig, analyst for ESPN. "I did get a little nervous initially but we've already done one segment of 'Baseball Tonight,' so I'm good now," he said.
During the regular season the countdown clock between innings was set to 2 minutes, 45 seconds for a national TV game. It was 3:15 for the first postseason game of 2015.
Astros: Jed Lowrie pinch hit in the ninth for Gomez, who looked as if he tweaked his injury while batting in the sixth.
Hinch will set his rotation for the Division Series. Houston went 4-2 against the Royals this season.