Montreal's Auger-Aliassime and Ottawa's Dabrowski were defeated 6-3, 6-4 by the second-seeded Greek tandem of Stefanos Tsitsipas and Maria Sakkari.
Auger-Aliassime and Dabrowski had a more accurate service game than the Greek team, particularly on second serve.
But the Canadians failed to take advantage of chances to take momentum in the match. Auger-Aliassime and Dabrowski couldn't convert any of the four break-point chances they had.
Tsitsipas and Sakkari made good on two of their six break-point opportunities.
The Greeks had six aces, two more than the Canadians.