Watson beaten in Auckland
Heather Watson was left to rue missed chances as she lost 6-4 3-6 6-3 to Kiki Bertens in the second round of the ASB Classic in Auckland.
The British number one, who overcame fifth seed Sorana Cirstea in the first round, converted five of 12 break-point chances in the match against an opponent ranked 14 places beneath her at 63rd in the world.
Watson also struggled on second serve, winning just four points in the first and third sets combined in a match which lasted two hours and 14 minutes.
The Guernsey player will remain in Auckland as she and partner Marina Erakovic are into the quarter-finals of the doubles, before heading to Hobart for her final tournament ahead of the Australian Open.
Bertens next faces Jamie Hampton, who beat Marina Erakovic 6-1 7-6 (7/2).
Meanwhile, second seed Julia Goerges suffered a shock as she was beaten 7-5 6-7 (1/7) 6-3 by Sweden's Johanna Larsson.
The world number 18 lost the first set against a player ranked 55 places beneath her but appeared to be back on track when she stormed through the second set tie-break to level.
But Larsson held firm, converting both of her break-point opportunities in the third to advance to a quarter-final against another German, eighth seed Mona Barthel, who beat Greece's Eleni Daniilidou 7-6 (8/6) 6-2.
There were no such problems for third seed Yanina Wickmayer of Belgium, who eased past Switzerland's Romina Oprandi 6-3 6-0 to set up a quarter-final with Kirsten Flipkens, a straight-sets winner over Pauline Parmentier.
In the day's other match, sixth seed Yaroslava Shvedova of Kazakhstan was beaten 6-2 6-3 by Russia's Elena Vesnina.