Johanna Konta's struggles on clay continued as a final-set slump saw her lose to Laura Siegemund in the first round of the Madrid Open.
Sixth-seed Konta, 25, was 3-0 up in the decider but German Siegemund took five straight games to progress 3-6 7-5 6-4.
The match ended at 02:17am local time and defeat means British world number seven Konta has still won just three games on the surface in her career.
Siegemund will face Estonia's Anett Kontaveit or American Coco Vandeweghe.
The world number 30 won the second WTA Tour title of her career last week at the Stuttgart Open.