Jonathan Mayo posted an article for the best tools in the Arizona Fall League and Tyler Glasnow was named the pitcher with the best breaking ball. Glasnow throws a big-breaking curve that sits 77-78 MPH, which really keeps hitters off-balance when paired with his mid-90’s fastball. Mayo mentions that one scout rated his curve as a plus-plus pitch.
The voting not only comes from Mayo, he also talked to scouts and took a poll of 50 players in the league. Glasnow was a runner-up for the best pitcher and got plenty of votes for the best fastball. No other Pirates players were mentioned among any of the other categories.