Carlos Alcaraz Withdraws From Cincinnati Open; US Open 2026 Participation Unclear. Daniil Medvedev and Alexander Zverev Sent PackingWorld No. 1 and top seed Alexander Zverev, 29, was the first major casualty of the day, falling to the Netherlands' Tallon Griekspoor in a gripping three-set encounter. Montreal Masters 2026: World No 1 Jannik Sinner, Novak Djokovic Withdraw From National Bank Open. Impact on the TournamentThe collective exits of Zverev, Medvedev, and Auger-Aliassime have profoundly reshaped the landscape of the National Bank Open singles draw.