9 out of the 16 players left in the Madrid draw on the men's side are not top 16 seeds. That means over 50% of the players left in the fourth round were not slated to get to this point in the tournament.
The top quarter is only top 16 seeds (Alcaraz v Zverev, Rublev v Khachanov) which means the bottom 3 quarters are 75% players that are replacing some seed. 9 out of 12 players aren't top 16 seeds in the bottom three quarters.
The players are as follows:
Zhang, Karatsev, Zapata Miralles (versing Fritz, Medvedev, and Tsitsipas respectively)
Munar vs Altmaier Coric vs Davidovich Fokina Cachin vs Struff
A player in each of those Round of 16 matches is making a Madrid quarterfinal. And none were even supposed to get to this point...
Posted May 1, 2023, 10:21 PM UTC
This trend will continue as Masters 1000 draws go from 48 to 96. This will result in more upsets of lower seeds and outcomes like this one.