First of all thanks to Jay Bradley for pointing this out over at RaysBB. This information comes from a article from the Bradenton Herald.
The article explains how Percival was brought in as a catcher with a big arm, but he couldn't hit.
"I'll teach you how to hit," said Joe Maddon, a hitting coach in the California Angels' instructional league in 1990.
Maddon tried a bunch of different things to change Troy's swing, but nothing seemed to work.
"Turns out he was just a bad hitter," Maddon said.
Percival has now had 324 saves in the majors, and looks back on it now.
"Joe was wrong," Percival said.
I think we are all glad on the way this turned out.