If you thought Zach Thornhill's windmill and between-the-legs dunks were impressive, wait until you see his behind-the-back slam.
Thornhill drew four perfect scores en route to winning the Kansas vs. Missouri All-Star dunk contest Friday at Rockhurst University in Kansas City, Missouri.
A senior at St. James Academy in Lenexa, Kansas, Thornhill committed to the Mavericks before ever watching a UNO game.
Check out the video below for all four of his slams.
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