The top two seeds in the ATP Sydney Open were upset in the quarter-finals on Thursday. The first seed Dominic Thiem was defeated by Dan Evans and the second seed Pablo Cuevas was defeated by sixth seed Gilles Muller. Two-time defending champion Viktor Troicki reached the semi-final without playing a single point, receiving a walkover from fifth seed Philipp Kohlschreiber.
Andrey Kuznetsov upset fourth seed Pablo Carreno Busta to reach the semi-finals. ATP Sydney Open Quarter-finals Daniel Evans (GBR) def.  Dominic Thiem (AUT) 3-6, 6-4, 6-1
 Gilles Muller (LUX) def.  Pablo Cuevas (URU) 7-6, 6-4
Andrey Kuznetsov (RUS) def.
 Pablo Carreno Busta (ESP) 2-6, 6-4, 6-1
 Viktor Troicki (SRB) def.  Philipp Kohlschreiber (GER) [W/O] Also Read Kooyong Classic Results