Frenchman Gilles Simon upstaged world number three Stan Wawrinka 6-4, 6-4 in the third round of the Shanghai Masters on Thursday, while top seeds Novak Djokovic and Andy Murray eased into the quarterfinals.
Djokovic enjoyed a 6-4 6-4 win over Canada's Vasek Pospisil while Murray was even more ruthless as he tamed 13th seed Lucas Pouille 6-1 6-3.
Simon, ranked 32nd in the world, took 96 minutes to beat U.S. Open champion Wawrinka and set up a last eight clash with American Jack Sock, who humbled fifth seed Milos Raonic 0-6 6-4 7-6(8).The Swiss was leading 3-1 in the first set but a flurry
of unforced errors allowed Simon to finish off the upset victory.
Defending champion Djokovic will face unseeded German Mischa Zverev, who battled past Spain's Marcel Granollers 6-7(4), 6-4, 6-1, for a place in the semifinals.Murray, who captured the China Open last week, won the first five games of the match and broke in the first game of the second to send Frenchman Pouille packing.
The Scot will next face Belgium's David Goffin, who came from a set down to defeat sixth seed Gael Monfils 4-6, 6-4, 6-2.Frenchman Jo-Wilfried Tsonga downed Alexander Zverev 6-7(4), 6-2, 7-5.