Listed at 5-foot-11 and 185 pounds, McKinney -- who has committed to play for Central Florida -- has limited projection. As a result, there's been speculation he could end up as a reliever down the road.
As a starter in high school, though, McKinney has had some brilliant games. In early May, he threw a shutout and gave up only four hits.
The left-handed pitcher has a fastball that hovers around 90 mph but normally sits in the high 80s. McKinney's slider is his most effective offspeed pitch, but he also throws a changeup and a curveball.
McKinney's clean, repeatable delivery is something that bodes well for his future. He has a good feel for pitching and solid command.
"We feel confident that we're going to be able to get him signed and that he's going to be pitching this summer," said scouting director Dan Kantrovitz.
Chad Thornburg is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.