SportsTennis: Alexander Zverev guaranteed to become world No. 1

Alexander Zverev secured the top spot by defeating Tallon Griekspoor 6-4, 7-5 at the ATP 500 tournament in Vienna. He is set to take over the rankings on Monday, November 2, replacing Jannik Sinner. Zverev will be the first German world No. 1 since Boris Becker in 1991 and the 30th player to reach the summit.