It seemed like everyone in the bulls lineup had No problems hammering fastballs at any velocity.
That said, Jakob Hernandez has been able to nudge his fastball up to 90 mph, but he uses it a lot for some reason. His curve is probably the best lefty breaking ball in the organization- if they could get him to throw it 60% of the time I think he could be a big league contributor.
Jeff Hoffman was 97 mph with his fastball any 87-88 mph with his curve- no idea how he was available to them on waivers.