As a rookie with the Cardinals in 1999, Jiménez pitched a no-hitter in the first of two consecutive starts defeating the Arizona Diamondbacks and future Hall of Famer Randy Johnson in 1−0 complete game shutouts. After converting to relief with the Rockies, he set club records for saves in a single season with 41 in 2002 and career with 102. Results were mixed in his last three seasons, as his earned run average in 2002 was 3.56 and he experienced consecutive season with 2−10 win–loss records and 1−7 in his final MLB season of 2004.