Ronnie O'Sullivan suffered a shock 5-4 defeat at the hands of teenager Aaron Hill during his first match back since winning the World Championship, knocking him out of the European Masters.
The Rocket found himself 3-1 down against a spirited Hill in the second round, but capitalised on his opponent's mistakes to win three consecutive frames to take the lead.
But 18-year-old Hill was not finished yet and forced a decider as O'Sullivan failed to pot a ball in the eighth frame.
'So upset' – Saengkham fights back from Covid-19 misery to stun Higgins
The two could hardly be separated as they each exchanged unforced errors, with O'Sullivan guilty of missing a number of routine reds. An epic safety battle ensued, but in the end, a fluke set the teenager on his way to a well-earned and famous victory.
'A star is born' – Hill stuns O’Sullivan at European Masters
Three-time world champion Mark Williams also crashed out after losing to rookie Peter Devlin, who only turned professional a month ago.
The 24-year-old took a 4-1 lead over the Welshman, and while Williams fought back to force a decider, Devlin held his nerve to beat the world No. 10 with a break of 102.
"What a time to make a century, in a deciding frame against someone like that. It's unbelievable," he said.
'Outrageous fluke!' - Hill gets lucky before beating Ronnie
"At 4-1, I knew I could have been pegged back. Players like that can win frames without you doing much wrong, so I was expecting a comeback.
"At 4-4, there was still a bit of adrenaline going but I managed to calm it down again."
- Trump slams slow Kleckers after quickfire victory
- European Masters: Latest draw, schedule and results
Devlin recently came through Q school and also works as a rapper on his YouTube channel.
"The way my life has changed in the last two months, I was so proud to get through Q School," he added.
"Straightaway I'm playing on television, with my mum shouting at me for missing balls, and it was great to play someone like Mark so early on.
Elsewhere, Mark Allen equalled the record for consecutive centuries after hitting four in a row in a 5-0 victory over Ken Doherty.
The Northern Irishman hit breaks of 134, 101, 141 and 145, but fell short of setting a new record in the fifth frame.
Allen also hit three centuries in his first-round victory over Florian Nuessle.
World Championship runner-up Kyren Wilson is also through to the third round after beating Chris Wakelin 5-0, alongside Ding Junhui who fought his way past Hossein Vafaei in a 5-3 victory.
AROUND THE TABLES
Ronnie O'Sullivan 4-5 Aaron Hill
Kyren Wilson 5-0 Chris Wakelin
Ding Junhui 5-3 Hossein Vafaei
Mark Williams 4-5 Peter Devlin
Mark Allen 5-0 Ken Doherty
Ding Junhui 5-3 Hossein Vafaei
Martin Gould 5-1 Ian Burns
Andrew Higginson 3-5 Duane Jones
Peter Lines 2-5 Anthony McGill
Neil Robertson 5-2 Riley Parsons
Chris Wakelin 0-5 Kyren Wilson
Robbie Williams 1-5 Pang Junxu
'Embarrassed himself' – Watch funny moment Vahedi messes up break-off shot
'I don't like maximums' – Doherty shows timeless class despite missing 147 chance