Fourth seed Rafael Nadal was stunned by Serb Viktor Troicki while Andy Murray breezed past American Steve Johnson in Shanghai Masters Tennis tournament yesterday. World number 31 Viktor Troicki overcame Nadal 6-3, 7-6 to secure his first ever victory against the 14-time grand slam winner. Twice Shanghai Masters champion Briton Andy Murray entered in the third round defeating Seve Johnson 6-3, 6-2. Australia's Nick Kyrgios lost to Germany's Mischa Zverev 6-3, 6-1 while seventh seed Tomas Berdych lost to Marcel Granollers of Spain 7-6, 7-6. US Open Champion third seed Stan Wawrinka beat Britain's Kyle Edmund 6-3 6-4 and Canada's Vasek Pospisil battled past Grigor Dimitrov 7-5, 7-6.