Heather Watson lost the last six games as she threw away a winning position in the deciding set to crash out of the BNP Paribas Open to Monica Niculescu.
Watson was leading 2-0 in the third set after winning seven games in a row but she fell apart to fall to a 6-4 2-6 6-2 defeat to the 32nd seed.
The British number two started poorly and trailed 5-1 before finding her feet but she had left herself too much to do and conceded the first set.
She broke to love in the opening game of the second set but immediately lost her serve despite holding a 40-0 advantage.
But the determined Watson again broke to love on the Romanian's next two service games as she reeled off five games in a row on her way to levelling the match.
But after being in control 2-0 up in the decider, things began to unravel for Watson and Niculescu rattled off the remaining six games to advance to the second round.