The job demands a lot. Pinch-hitters must ready themselves physically and mentally for an at-bat that could come at any moment -- or never. Not all hitters are capable. Not all are fully willing. Those who are both might seize an opportunity to extend or expand a career.

Source: Baseball-Reference.com (pinch-hitting stats available back to about 1940).

Related Story: How MLB's Best Pinch-Hitters Prepare

-- Andrew Simon writes for MLB.com. You can follow him on Twitter @AndrewSimonMLB.

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