The German will replace Jannik Sinner and become the second German player to reach that position after Boris Becker. The top ranking is secured for the next list; the Vienna tournament title remains undecided.
Zverev advanced to a quarter-final against Britain’s Arthur Fery scheduled for 30 October, as confirmed by the tournament’s official draw. ORF and French and Spanish sports reporting describe the victory over Griekspoor and its ranking implications.