Montreal's Felix Auger-Aliassime had his comeback attempt fall just short in a 7-5, 4-6, 7-6 (5) loss to Andrey Rublev on Friday in the semifinals of the Qatar Open.

Down 6-3 in the third-set tiebreaker, Auger-Aliassime scored the next two points on serve. But when the serve rotated to Rublev, the fifth-seeded Russian converted on his third match point.

Auger-Aliassime lost despite firing 21 aces in the match. The world No. 23 failed to convert what turned out to be a crucial break-point chance in the first game of the third set as the players held serve the rest of the way.

Rublev improved to 6-1 against Auger-Aliassime and will next face the winner of a match between eighth-seeded Briton Jack Draper and Czechia's Jiri Lehecka, who advanced to the final four with a shocking quarterfinal upset of top seed Carlos Alcaraz.

WATCH l Auger-Aliassime edged by Rublev in Qatar Open semifinal:

Auger-Aliassime falls to Rublev in Qatar Open semifinal battle

Russian Andrey Rublev bested Montreal's Felix Auger-Aliassime 7-5, 4-6, 7-6(5) in the semifinals of the Qatar Open in Doha.

Auger-Aliassime had advanced to the semifinal of the ATP 500 tournament after fourth seed Daniil Medvedev retired from their quarterfinal with food poisoning after dropping the first set 6-3.

The 24-year-old Canadian has a 14-4 record this season after winning titles last month in Adelaide, Australia and Montpellier, France.