Andrey Rublev is the highest seed left in the Qatar Open after a dramatic day that saw fellow Russian Daniil Medvedev quit his quarter-final with food poisoning.

Four of the top-seeded players of the Qatar Open advanced to the quarterfinals of the tournament. Alex de Minaur, Andrey Rublev, Daniil Medvedev, and Jack Draper won their matches in straight sets. Top-seeded player Carlos Alcaraz can join them among the last eight later if he beats Italy’s Luca Nardi.

Montreal's Felix Auger-Aliassime advanced to the quarterfinals of the Qatar Open tennis tournament Wednesday when second-round opponent Hamad Medjedovic withdrew with a right leg injury.