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World champion Luca Brecel was knocked out of the German Masters after suffering a 5-2 first-round loss to India’s Ishpreet Singh Chadha.
The Belgian, who has struggled since winning the world title last year, hit breaks of 84 and 77 as he went 2-1 up.
Chadha, who had beaten Stuart Bingham in qualifying, then reeled off four frames in a row to secure victory.
There were also upsets as Mark Selby was beaten 5-1 by Marco Fu, while Shaun Murphy lost 5-3 to Xu Si.
Mark Allen was given a scare before producing a break of 100 in the deciding frame to earn a 5-4 victory against Manasawin Phetmalaikul.
Judd Trump and Neil Robertson also progressed with respective 5-0 and 5-1 wins against Lukas Kleckers and Sanderson Lam.