Novak Djokovic overcame a first-set wobble to beat Serbian countryman Viktor Troicki and reach the Paris Masters quarter-finals on Thursday.
Djokovic, the world number one, was broken twice in the first set at Bercy Arena and folded on Troicki's first set point when he drove a backhand into the net.
The top seed went 2-0 up in the second set, only for Troicki to level, but Djokovic broke again to go 4-2 ahead with a cross-court backhand winner before levelling the match.
Troicki had lost his last nine encounters with Djokovic and the 15th seed's resistance broke apart in the third set, enabling the 2009 champion here to complete a 4-6, 6-3, 6-1 win.
Djokovic will play either French sixth seed Jo-Wilfried Tsonga or Italy's Andreas Seppi for a place in the semi-finals.