Johanna Konta refused to shake the chair umpire's hand and stormed off court after losing to Ashleigh Barty in the Nottingham Open final.
Aleksandra Krunic capitalised on a Kirsten Flipkens collapse to win her first WTA Tour title in style in Rosmalen.
Top seed and two-time champion Coco Vandeweghe failed to convert match point in defeat to Aleksandra Krunic.
Alison Riske was unable to take seven chances to beat Coco Vandeweghe, who advanced to the semi-finals in the Netherlands.
The top seed, the defending champion and the British number one all progressed to the quarter-finals at the Nottingham Open on Thursday.
Maria Sharapova will delay her start to the grass-court season and Madison Keys is being troubled by an abdominal injury.
The Nottingham Open quarter-finals will see Mihaela Buzarnescu face Naomi Osaka after both enjoyed wins on Wednesday.
There will be no comeback for Marion Bartoli after a shoulder issue prevented her attempts to make a return to the WTA Tour.
Anett Kontaveit fell at the first hurdle in Hertogenbosch, but Ashleigh Barty started her grass-court campaign with a routine win.
After seeing her doping ban extended to 10 months, Sara Errani hinted at retirement.