Australian Open champion Jannik Sinner extended his winning run to 19 matches by beating Jiri Lehecka to reach the Indian Wells semi-finals - before a swarm of bees stopped play.
Italian Sinner beat Czech Lehecka, ranked 32 in the world, 6-3 6-3.
"He has huge potential so I was really aware of every point that I made," said third seed Sinner, 22.
Sinner will face defending champion Carlos Alcaraz or German Alexander Zverev in the last four.
Play was halted in their quarter-final match later on Thursday after bees swarmed the court.
World number two Alcaraz ran off court as the bees buzzed around one of the cameras and gathered under the chair of umpire Mohamed Lahyani, who announced: "Ladies and gentlemen, play is suspended due to bee invasion.