When I first proposed this feature to Spinmove he said "Oh, you mean like when someone says a running back has home run speed?" At the time, I didn't think it was that significant, but after 4 weeks of mild awareness and infrequent, snarky blogging, I've concluded that 73% of all mixed-sports metaphors involve a football running back being described as having the ability to hit a home run.
What separates this one from the pack, and makes it vaguely useful as comparative trope, is the "pinch-hit" part:
This doesn't necessarily mean we've seen the last of Fast Willie. He might still help the Steelers. He is capable of a pinch-hit homer, even if he hasn't had a run longer than 34 yards since late in '06.
Good job, Trib. You earned that one.