Carlos Alcaraz was dumped out in the third round of the Shanghai Masters as Zizou Bergs recorded the biggest win of his career.
Bergs defeated the second seed 7-5, 7-6 (7-4), recovering to win the second set in a tie-break after failing to serve out the match at 6-5.
Alcaraz, who won the Japan Open in Tokyo last Tuesday, was chasing a ninth ATP Masters 1000 title and his first of an injury-hit 2026 season. However, it is Bergs who will now face either defending champion Valentin Vacherot or American Tommy Paul in the next round.
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Elsewhere, 2019 champion Daniil Medvedev - defaulted at last week's China Open in Beijing after hitting a fan with a ball while facing Novak Djokovic in the semi-finals - joined Bergs in round four after a straight-sets victory over qualifier Dalibor Svrcina.
Medvedev will take on Stefanos Tsitsipas next after the Greek upset 11th seed Taylor Fritz 3-6 7-5 6-3.
Kartal continues encouraging comeback with victory in Wuhan
At the Wuhan Open in China, Britain's Sonay Kartal defeated top-50 opponent Anhelina Kalinina to set up a second-round clash with ninth seed Belinda Bencic.
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Kartal recently returned from a six-month absence with a stress fracture in her back, reaching the third round of the Beijing Open last week in her first WTA tournament back.
The British No 5 - whose compatriot Katie Boulter begins her campaign against 11th seed Diana Schnaider on Tuesday - won 7-5 6-2 win in 91 minutes, hitting four aces.
Kartal said: "I've thrown myself in the deep end, playing [my] first few events playing the best players in the world. It's definitely a challenge, but I'm happy with the level that I've managed to produce.
"There is still got a long way to go to get to back where I left off, but I'm happy. It's looking positive and I'm feeling good."
Stream ATP and WTA Tour tennis with no contract on NOW and through the Sky Sports App. The Shanghai Masters and Wuhan Open run until Sunday October 18.