Britain's Andy Murray fell to a straight-set defeat against Russian fifth seed Andrey Rublev in the third round at Indian Wells.
Three-time Grand Slam champion Murray, 36, was beaten 7-6 (7-3) 6-1 by Rublev in a high-quality match in California.
Murray, who has said he is not planning to "play much past this summer" as he considers retirement, missed four set points when leading the first set 5-4.
He then quickly faded in the second after losing serve in the fourth game.
Australian Open champion Jannik Sinner progressed with a straight-set victory over Australian Thanasi Kokkinakis.