Number 1–Ubaldo Jimenez (18.9 bWAR, 18.6 fWAR, part of six seasons as a Rockie)
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Ubaldo Jimenez is, undoubtedly, the best pitcher in Colorado Rockies, at least thus far. From 2008 through 2010, he put together three of the best seasons that a Colorado Rockies pitcher has ever posted.
Overall as a Rockie, Jimenez pitched to a 56-45 record with an ERA of 3.66 in 138 games (137 starts). He had an ERA+ of 128, a FIP of 3.58, and a WHIP of 1.284. He is the Rockies all-time leader in pitching WAR, ERA, hits allowed per nine innings, shutouts (tied with Jason Jennings), home runs allowed per nine innings, ERA+, and FIP. He is 5th in Rockies history in wins, 2nd in WHIP, 3rd in strikeout rate, 5th in innings, 2nd in strikeouts, 3rd in complete games, and 5th in starts.
His best season came in 2010 when he had, arguably, the best season that a Colorado Rockies starting pitcher has had. He went 19-8 with an ERA of 2.88 in 33 starts (221 2/3 innings). He had an ERA of 161, a FIP of 3.10, and a WHIP of 1.155.
He also started the All-Star Game for the National League, came in 3rd in the NL Cy Young Award voting and came in 23rd in NL MVP voting. Also, he had a no-hitter against the Atlanta Braves in his third start of the season.
No doubt on this one: Ubaldo Jimenez is the best starting pitcher in Colorado Rockies history.