Britain's Andy Murray lost to Russian top seed Daniil Medvedev at the Miami Open, as Heather Watson also went out.
Medvedev, who must reach the semi-finals in Miami to reclaim the world number one ranking from Novak Djokovic, won 6-4 6-2.
Murray, 34, a two-time winner, has not won back-to-back matches since January.
Compatriot Watson was beaten in straight sets by Switzerland's Belinda Bencic in her third-round match, losing 6-4 6-1 in Florida.
Watson, who claimed her first win over a top-20 player since 2020 by defeating Ukrainian Elina Svitolina in the previous round, was contesting a third-round match in Miami for the first time in six years.