Britain’s Johanna Konta has been sent packing from the Dubai Duty-Freee Championships after losing 6-4 6-7 (6-8) 2-6 to Russia’s Daria Kasatkina in the last 16.
The British No 1 led by a set and 3-1 and was on the verge of victory at 6-4 in the second-set tie-break, but Kasatkina won four straight points, taking the set with a winner that just clipped the baseline.
The 20-year-old then proved the more consistent in the decider to wrap up the match after two hours and 59 minutes to set up a quarter-final against countrywoman Elena Vesnina.
Konta, the world number 12 and seventh seed, saved seven break points in the first set before taking the opener.
But the British number one blew two match points in the second set tie-break as Kasatkina levelled the scores.
Kasatkina broke for the first time on her 10th break point to force the tie-break and had the momentum in the third set against a tired Konta.
In a tight encounter, which finished just before midnight in Dubai, the Briton will be kicking herself after 63 unforced errors not helping her cause.
Kasatkina will face fellow Russian Elena Vesnina in the quarter-finals who saw off Latvian fourth seed Jelena Ostapenko.
And Ukrainian top seed Elina Svitolina, the defending champion, will take on Japanese wild card Naomi Osaka in a bid to secure her place in the semi-finals.