PEORIA, Ariz. -- Luis Perdomo's sinker is such a new pitch, the rest of the baseball world is still learning about it.
Evidently, so is Perdomo.
The 23-year-old right-hander developed his signature out-pitch last May, when the Padres front office asked him to try something new. It helped turn Perdomo, then a struggling rookie reliever, into arguably the club's most effective starter.
But because it came about midseason, Perdomo says he's still learning to harness the pitch. With an offseason under his belt, he feels as though he'll be able to better command his biggest weapon this season.