• Zverev's main tour record of 3-8 (3-9 counting Laver Cup) is the worst record from a YE #1 in the 54 year history of ATP rankings.
• The only other <50% win rate was by Stefan Edberg in 1991 (5-8).
• Across the 53 previous No. 1 seasons (1973–2025), the mean Top 10 win rate was 73.9% and the median was 73.7%.
• Zverev also has the 2nd lowest career Top 10 Win % among players who have finished YE #1 (Andy Roddick being the lowest).
• Data for seasons covers main-tour singles matches (no Laver Cup, Davis Cup, etc.).

Full data: https://tennis-db.com/research/year-end-number-ones-against-the-top-10

https://preview.redd.it/9sb9uh8kc7zh1.png?width=1221&format=png&auto=webp&s=44db687d0b55a9f1a4d4398e9f1a12358559f2a6