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Johanna Konta saw her run at the Generali Ladies Linz ended in the second round with a straight-sets defeat to Madison Brengle of the United States.
The 24-year-old Briton, who at 47 is ranked five places below her opponent, was hoping to extend her excellent end-of-season form into another match after being handed a lucky loser spot in Austria and thrashing Annika Beck of Germany in the opening round.
However, fortune deserted her against Brengle, who claimed a 6-3 7-5 win in 92 minutes to reach the last eight of the competition.
Nerves seemed to get the better of Konta in the opening set, with a single break of serve in the fourth game enough to see her playing catch-up against her American opponent.
Brengle's dominance then faltered at the start of the second, with neither player able to hold serve across the opening four games while the American struck again in the fifth to take a 3-2 lead.
This time the world number 42 managed to strengthen her advantage by holding serve, but Konta responded by reeling off the next two games to pull level and give herself a fighting chance.
The topsy-turvy contest continued as both players fought to gain a foothold until Brengle finally gained the decisive break in game 11 before serving out the match to set up a quarter-final meeting with either Sweden's Johanna Larsson or Belgian Alison Van Uytvanck.