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And they'll tell you that there isn't much difference between the two.
The groupthink is that the fork and change are so similar there would be no point to Beavan learning it (the change is already his #2 pitch).
That ain't what I see on TV, though. Clemens' and Fassero's and Finley's and Dempster's and Nolasco's (and League's!) forkballs aren't to be discussed in the same conversation with changeups.
I guess Beavan will bop along with that average little changeup that gets topped for groundballs. Maybe the yakker will come around, as with McCarthy.