British number one Elena Baltacha slumped to a disappointing first-round defeat at the Baku Cup in Azerbaijan.
The 27-year-old sixth seed was beaten 6-1 7-5 by Ukraine's Mariya Koryttseva, a player 105 places below her in the world rankings.
Having been comprehensively outplayed in the opening set, Baltacha broke twice to lead 3-0 in the second.
But she continued to struggle on serve and Koryttseva, 26, wrapped things up with her first match point.
In her first outing since Wimbledon, Baltacha only achieved a first-serve percentage of 54% and her second was picked off by an opponent who won their only previous meeting on the WTA Tour in Moscow last year in three sets.
"Tough one today. Disappointed but I'll keep working hard," was Baltacha's reaction on her personal Twitter page.