Defending BNP Paribas Open champion Carlos Alcaraz and sixth seed Alexander Zverev were forced off the court for nearly two hours by a swarm of bees during their quarter-final match in Indian Wells.
With the Spaniard serving at 1-1 in the first set the bees invaded the court area, stands and covered cameras.
The umpire Mohamed Lahyani suspended the match and the players retreated into the tunnel, swatting bees away as they went.
A member of staff appeared to be attempting to vacuum some bees off the camera equipment while play was suspended.
The match had only been going for nine minutes when the bees disrupted play, with the eventual winner to face Italian Jannik Sinner in the semi-finals.
Sinner defeated Jiri Lehecka 6-3, 6-3 to cruise into the semi-finals and continue his 16-match winning streak this year.
Womenâs world No 1 Iga ĹwiÄ tek said she was glad she was not on the court when the bees flew in.
âThatâs crazy,â she said in her post-match press conference. âThere was nothing like [that] 30 minutes ago. I would run away!â
Earlier, ĹwiÄ tek of Poland reached the semi-finals when former World No 1 Caroline Wozniacki of Denmark retired in the second set of their quarter-final.
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Wozniacki, who won at Indian Wells in 2011, held a 4-1 lead in the first set before Swiatek rallied for a 6-4 win.
Wozniacki took a medical time-out in between sets for a foot issue, then played just one game in the second set before pulling out of the match. Swiatek, seeking her second title at Indian Wells in three years, won the match 6-4, 1-0.
âI have huge respect for her,â ĹwiÄ tek said. âIâm sad that it had to finish that way, but I hope she is going to recover and be ready for Miami.â
Next up for ĹwiÄ tek in the semi-finals will be No 31 seed Marta Kostyuk of Ukraine, who beat No 28 seed Anastasia Potapova of Russia 6-0, 7-5 in just 68 minutes.