Aliassime will face Andrey Rublev in the Qatar Open semifinals after he beat fellow Russian Daniil Medvedev when the latter retired after losing the first set 6-3 on Thursday in Doha.

Felix Auger-Aliassime will compete in the semi-final of the ATP 500 event in Doha. The 24-year-old Canadian played only one sets in the second round and quarter-final, preserving energy for the latter stage of the tournament.

Montreal’s Felix Auger-Aliassime advanced to the semifinals of the Qatar Open tennis tournament after Russia’s Daniil Medvedev retired from their quarterfinal with an illness. Auger-Aliassime won the first set of Thursday’s match 6-3 before Medvedev, who was seeded fourth at the ATP 500 tournament, left the court.

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.

Felix Auger-Aliassime is into the Doha semifinals after Daniil Medvedev retired from the quarter-final on Thursday with an illness.

Auger-Aliassime won the first set of Thursday’s match 6-3 before Medvedev, who was seeded fourth at the ATP 500 tournament, left the court

Montreal's Felix Auger-Aliassime advanced to the semifinals of the Qatar Open tennis tournament after Russia's Daniil Medvedev retired from their quarterfinal with an illness.