British number one Emma Raducanu bowed out in the third round at Indian Wells as Croatia's Petra Martic claimed a hard-fought win in California.
The match swung back and forth, and Raducanu, 19, had a chance to serve for the win at 5-4 in the deciding set.
But Martic, the world number 79, took the last three games to win 6-7 (3-7) 6-4 7-5 against the US Open champion.
Raducanu, the world number 13, will now prepare to play at the Miami Open from 21 March.
The Briton won four straight games to lead 5-3 in the first set but Martic broke back to force a tie-breaker, which Raducanu won with a superb passing shot.