It is known what Zverev needs to become number 1 on the ATP list
It's only a matter of time when Alexander Zverev will take over the number 1 position on the ATP list.

TL;DR
- Alexander Zverev is close to becoming the world number 1 tennis player.
- Reaching the quarterfinals in Vienna will secure him the top spot.
- He trails Jannik Sinner by 100 points, with the quarterfinal prize matching that deficit.
- Zverev's success in Grand Slams this season gives him an advantage in case of a tie in points.
- His next opponent is Spanish wildcard Martin Landaluce, ranked 67th.
- A win against Landaluce would put Zverev one victory away from the quarterfinals and the number 1 ranking.