Definitely the best modern day pitcher and probably top five all-time. The problem with comparing him to a guy like Grove or Young is that the advent of five-man rotations and relief pitchers changed things so much. Five-man rotations meant less starts and relievers meant a pitcher could run out of gas in the sixth but have someone else finish his win for him.\n\nThe problem with Clemens is he doesn't lead career strikeouts, wins, or winning percentage, so it's hard to say he's OBVIOUSLY the best ever. He has alot of Cy Young awards but that's just as much a measure of league talent as it is an individual pitcher's talent. Top Five in no particular order: Clemens, Carlton, Walter Johnson, Warren Spahn, Cy Young.