Alexander Zverev has received public backing from a former coach of Serena Williams amid ongoing debate about whether the German star merits his position as world number one in men's tennis.
The defense comes as critics have questioned Zverev's claim to the top ranking, though specific details of the criticism and the identity of the coach were not disclosed in the initial report.
Zverev, a multiple Grand Slam finalist and Olympic gold medalist, has held the world number one ranking at various points in his career. The controversy highlights the scrutiny faced by top-ranked players regarding the consistency and quality of their results relative to the ranking system.
