Heather Watson's run in the Miami Open came to an end in the fourth round with a 6-3 6-4 defeat by Simona Halep.
British number two Watson, 23, led 3-1 in the opening set before losing the next five games to the Romanian.
Fifth seed Halep, 24, then broke Watson twice more to win the second set 6-4 and reach the last eight for the second year in a row.
British number one Johanna Konta faces 32nd seed Monica Niculescu of Romania later on Monday.