Phillies call up promising rookie pitcher Orion Kerkering

year-old Kerkering is being called up from Low-A Clearwater.
Kerkering has impressed scouts with his breaking ball and slider.
It's unclear what Kerkering's exact bullpen role will be.
Kerkering will be eligible for the postseason roster as Hoskins' injury replacement.
Kerkering has had an excellent season across multiple minor league levels.