British No 3 Heather Watson suffered heartbreak as she narrowly failed to make the final of the Coupe Banque Nationale in Quebec City.
Bidding to reach her first WTA Tour final in two-and-a-half years, Watson was edged out 5-7 6-3 7-6 (7-5) by eighth seed Pauline Parmentier in a marathon contest lasting two hours and 35 minutes.
Watson had twice broken her opponent, ranked 38 places higher at 69 in the world, to take the advantage but was broken three times in the second as Parmentier pulled back level.
Watson looked to be the aggressor for large parts of the decider and did not face a single break point against her, but was unable to seize the initiative in the tie-break.
In the final Parmentier will face American qualifier Jessica Pegula, who continued her superb week with a 4-6 6-2 6-4 success against compatriot Sofia Kenin.
Seventeen-year-old qualifier Amanda Anisimova overcame number one seed Zhang Shuai of China to reach the final of the Hiroshima Open in Japan.
Anisimova's 7-6 (7/4) 7-5 win makes her the youngest player to reach a WTA Tour final since a then 16-year-old Donna Vekic in Birmingham in 2013.
The American will now target a stunning title win against Hsieh Su-wei after the Chinese Taipei player beat China's Wang Qiang 6-4 6-4.