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Jonathon Simmons chases down the block About the NBA: The NBA is the premier professional basketball league in the United States and Canada. The league .

Jonathon Simmons showcases his athleticism with a massive chase down block. The Spurs offensively followup the dynamic defensive play with a nice dunk by .
Former Austin Spurs standout Jonathan Simmons continued to show off his athleticism with the Spurs Summer League team, including a chase-down block and .