Backe's star continued to rise during the 2004 playoffs. After earning a win in Game 3 of the NL Division Series against the Atlanta Braves, Backe gained national attention with an eight-inning, one-hit performance against the St. Louis Cardinals in Game 5 of the NL Championship Series. Going toe-to-toe with Cardinals starter and Houston native Woody Williams, Backe carried a perfect game into the 5th inning and a no-hitter into the 6th inning, surrendering only a bloop single to St. Louis second baseman Tony Womack. Backe's pitching performance set the stage for Jeff Kent's walk-off home run in the ninth inning, giving the Astros a 3-2 series advantage headed back to St. Louis, however the Astros lost both subsequent games and the series.