Britain's Johanna Konta was knocked out of the Miami Open after a fourth-round defeat by three-time champion Venus Williams.
Defending champion Konta, ranked 14th in the world, won the first set but eventually lost 7-5 6-1 6-2.
The British number one had beaten Williams in straight sets in the semi-finals 12 months ago.
American Williams, 37, will play Monica Puig or Danielle Collins in the quarter-finals.
Konta, 26, saved set point to turn the first set - which lasted just over an hour - in her favour and take the early advantage.
But Williams cruised through the second set to even the score, with Konta requiring a medical timeout before the deciding set.