Pospisil Hits Behind The Back Lob At Busan Challenger 2017 May 20, 2017 Vasek Pospisil was on fire in reaching the final at the ATP Challenger Tour event in Busan, South Korea, firing a behind the back Hot Shot on Saturday. Tags: 2017 Challenger Hot Shot Vasek Pospisil Share 0 Share on Facebook Tweet Tweet on Twitter +1 +1 on Google Plus