The best left field prospects are probably already mentioned in my center field prospect breakdown. In fact, if I was pulling a likely outfield from that group, I’d have Travis Swaggerty in center field and Matt Fraizer in left field.
Fraizer isn’t the only option from that list. PNC Park’s left field plays like a second center field, so filling the spot requires someone who could be considered for center, with the ability to hit like a corner outfielder.
Aside from the center field prospects, there are some infielders who could be candidates to move to the outfield.