This comes from an indoor tournament in Switzerland between Grigor Dimitrov and Viktor Troicki.
The 62nd-ranked Dimitrov hit an insane behind-the-back drop shot by seemingly dangling his racquet behind his body after overrunning a passing shot by Troicki.
The spin he gets on it is unreal. Dimitrov ended up winning 6-3, 6-2 (via Devour).
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