Oct 30 : Alexander Zverev ensured he would overtake Jannik Sinner in the rankings and become world number one for the first time next week with a 6-4 7-5 victory over Tallon Griekspoor in the last 16 of the Vienna Open on Thursday.The 29-year-old, who has enjoyed a stellar season capped by titles at the Frenc

The 29-year-old had already been assured of finishing the season at the top of the ATP rankings, but victories over Martin Landaluce and Griekspoor in Vienna have confirmed that he will replace Jannik Sinner as the world’s highest-ranked player in Monday’s updated standings.