Eugenie Bouchard made another miserable start to the grass-court season when she suffered an emphatic first-round defeat to qualifier Elise Mertens at the Rosmalen Grass Court Championships.
Former world number five Bouchard lost her opener in each of the last two years at the WTA International tournament in the Netherlands and fell at the first hurdle once again on Monday.
The seventh seed from Canada, beaten by Timea Bacsinszky in the second round of the French Open, went down 6-2 6-0 against unheralded Belgian Mertens in only 52 minutes.
Bouchard won only 43 per cent of points on her first serve and a mere 18 per cent on her second, as world number 171 Mertens hit the ground running on grass at the expense of the 2014 Wimbledon runner-up.
Fifth seed Laura Siegemund also bowed out on day one of the tournament, losing 6-3 3-6 6-2 to unseeded American Madison Brengle.
Brengle had lost four matches in a row, but put that dismal run behind her by claiming her first victory against the 42nd-ranked German after breaking on five occasions.
Coco Vandeweghe joined her compatriot Brengle in round two by seeing off wildcard Indy de Vroome 6-2 6-4, while qualifier Natalia Vikhlyantseva claimed a surprise 6-2 6-1 win over Denisa Allertova.
Kiki Bertens was ruled out of the tournament in her homeland due to a torn calf muscle sustained on her run to the semi-finals of the French Open.