Seven-time world champion Ronnie O’Sullivan, world number one Zhao Xintong and defending champion Mark Williams were knocked out on the opening day of the Shenzhen Open.

China’s Jiang Jun, who is 64th in the world rankings, took the opening two frames before England’s O’Sullivan levelled with breaks of 92 and 52.

Jiang reeled off the next three frames, sealing a famous 5-2 second-round win with a superb break of 108 to set up a meeting with Englishman Zak Surety.

Scott Donaldson stunned 2025 world champion Zhao by winning a final-frame decider.

Scotland’s Donaldson, who is 65 places below Zhao in the rankings, compiled breaks of 77, 105, 50 and 62 as he came from 3-2 down.

Donaldson will take on China’s Pang Junxu in round three.

Welshman Williams lost 5-4 to China’s Fan Zhengyi after fouling on the final pink.

England’s Judd Trump cruised to a 5-0 win over China’s Huang Jiahao and goes into the last 16 after Anthony McGill, his scheduled third-round opponent, withdrew on medical grounds.

In Monday’s other second-round encounters, Australia’s Neil Robertson beat China’s Liu Hongyu 5-2, England’s Chris Wakelin claimed a 5-3 win over Welshman Liam Davies and China’s Si Jiahui swept to a 5-1 success against England’s Oliver Lines.

Belgium’s Ben Mertens also progressed as Northern Ireland’s Mark Allen withdrew for personal reasons.

Wales’ Jamie Clarke, England’s Andrew Higginson, Hong Kong’s Marco Fu and England’s Sam Craigie progressed in the first-round matches that took place on Monday.