Felix Auger-Aliassime fell to Alex Molcan Thursday in the quarterfinals of the Grand Prix Hassan II ATP event 6-4, 2-6, 7-6 (7).
Auger-Aliassime entered the tournament as its top seed but got upset by Molcan.
The 21-year-old Montreal native committed 10 double faults in the match as unforced errors of his own factored into his defeat.
Molcan is ranked 65th in the world while Auger-Aliassime is ranked No. 9.
The Slovak will next see the Netherlands' Botic van de Zandschulp in the semifinals of the event.
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