The baseball blog Sabernomics recently argued for a return to the three-man rotation in the playoffs. They even dug up an old research study that seems to back them up with science.
The gist is that most of the recovery that takes place in a pitcher’s arm happens in the first 24 hours after a start. Within two days, their muscles are basically back to normal, so resting another two days doesn’t make an appreciable difference in his performance.
Therefore, three reasonably healthy pitchers should be enough to carry you through a seven-game series. Even so, both the Giants are Rangers have announced four-man rotations for the World Series.
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