Standing at 6-foot-5 and just 160 pounds, McKenzie has a very thin frame, but he is also one of the youngest players in the Draft at just 17 years old. His fastball currently sits between 89-92 mph, though scouts believe he can add velocity once his frame fills out.
As a senior at Royal Palm Beach High School in Florida, McKenzie compiled a 9-5 record with a 0.79 ERA, striking out 157 batters in 91 innings and walking just 16. He led his school to the Class 7A state tournament for the first time since 2000, throwing five complete games in the tournament and allowing just four runs.