Eugenie Bouchard suffered an early exit on the opening day of the grass-court season when she was beaten 6-2 6-0 by qualifier Elise Mertens at the Ricoh Open in s'Hertogenbosch.
The Canadian seventh seed, who reached the 2014 Wimbledon final, was broken three times by the Belgian, ranked 171st in the world, as she lost the opening set in 30 minutes.
The world number 46 could not mount a comeback as she soon trailed 3-0 after failing to hold on to her first two service games, before Mertens converted another break chance and then served out an unexpected comfortable victory.
WTA Toronto
'She gave us a path to follow' - Williams tributes pour in from younger generation

Eugenie Bouchard went out in the first round of the Ricoh Open at s'Hertogenbosch

Image credit: PA Sport

Number five seed Laura Siegemund is also out after the German lost 6-3 3-6 6-2 to American Madison Brengle.
However, Coco Vandeweghe did progress, as the sixth seed from the United States disappointed the home crowd when she beat Dutchwoman Indy De Vroome 6-2 6-4.
WTA Toronto
Improving, not just winning, on Swiatek's mind ahead of Toronto opener
Andreescu hopes to continue on Williams' legacy