Novak Djokovic celebrated his elevation to world number one by reaching a new personal landmark to reach the Paris Masters quarter-finals on Thursday. The Serb won his last 16 tie with Damir Dzumhur after the Bosnian was forced to retire trailing 6-1, 2-1 at Bercy.

For second seed Djokovic it meant he extended his sequence of consecutive winning sets to 30, passing his previous best mark of 29 from 2015. The four-time Paris champion faces Marin Cilic in the last eight on Friday. Djokovic takes over as world number one in the latest ATP rankings published Monday from Rafael Nadal, who withdrew injured from Paris on Wednesday. Cilic, the fifth seed, secured his quarter-final ticket with a 7-6 (7/5), 6-4 defeat of Grigor Dimitrov.