Jonathan Clark, who dunks as J-Clark the Jumper, is a 6’3” two-foot dunker from Los Angeles with a 48 inch vertical. He plants left-right and his signature is called Jonathan’s Wall.
He reached the semi-finals of The Dunk King, TNT’s 2017 dunk series, where his round against Brandon LaCue was carried by NBA.com. That series was the first time a televised bracket put real money and a real scoreboard behind dunking.
Nine years later he is one of the 24 athletes contracted to the Dunkman League. He finished third in Group Stage B on July 28, 2026 with 4.64, behind Dillan McCarthy and Avante Nichols, and took Dunk of the Night.
The league runs four group stages of six dunkers at the Overtime Elite Arena in Atlanta. The four group winners advance to the World Championship on August 25, along with the four highest scoring non-winners across all groups, for a field of eight and a $500,000 prize. The remaining four places went to the highest scores across every group, and his 4.64 finished outside them. He did not advance.
He is also one of the 37 dunkers rated in Dunkdle, where he sits inside the top ten.