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I know what most of you are thinking right now and I completely agree, Roger Clemens was a fraud and a cheater. However, you can't pass up the fact that he was extremely good during his three-year stint with the Astros.
In 2004, he went 18-4, had a .814 winning percentage, a 2.98 ERA and won the Cy Young award. Then in 2005, Roger Clemens was literally a beast for the team. He went 13-8 with an incredible 1.87 ERA. Averaging 7.9 strikeouts per nine innings and posting a 7.2 WAR, Roger Clemens was having an incredible year late in his career. However, it wasn't his regular season supremacy that made him a legend in the eyes of Astros fans, it was his postseason heroism that secured his legacy.
In the 2005 NLDS against the playoff rival Braves, the Astros mounted an incredible late game rally to put the game into extra innings. The game went all the way to the 16th inning when Roger said that he was ready for manager Phil Gardner to put him in the game on only one day of rest, and in he went without warming up, and he completely dominated for another three innings until Chris Burke hit the legendary walk-off homerun in the 18th to seal the deal and give "The Rocket" his first relief win in the playoffs.