Posted By:
Greg EcklundI'd go with Grover Cleveland Alexander as the most underrated, even though he played half his career in the deadball era and half in the live ball era. Alexander's run from 1915-1917 is possibly the best three year run of any pitcher, and had he not served in the trenches of World War I (which contributed to his serious drinking problem) he might have been the best ever.
Alex deserves to be mentioned in the same breath as Mathewson and Johnson, but he doesn't seem to be on the same level in the minds of many people (Perhaps because he doesn't have that many great cards?)