Lilley began playing snooker at the age of 13.[4] His first big success was his victory at the (amateur) European Championships in 1995, defeating his compatriot David Gray 8–7. In the same year, he lost to Paul Hunter in the final of the Northern Amateur championship.[4] In 1997, he reached the final of the English Amateur Championship for the first time and won it with a score of 8–7 against Robert Marshall. However, unable to find sponsorship in the wake of the sport's ban on tobacco advertising, and with only around six tournaments a year at that point, he felt he could not afford to turn professional and so remained an amateur.[4]
In 2000, he lost the final of the English Amateur Championship, 5–8 against Nick Marsh.[5]
In February 2002, he participated for the first time in qualifying for the World Snooker Championship, but lost in the second qualifying round against Timothy Paling.
In 2004, Lilley won the English Amateur Championship for a third time, with an 8–6 victory over Wayne Cooper in the final.[5] In the 2004 World Amateur Snooker Championship, he was narrowly defeated in the semi-finals 6–8 by the eventual champion Mark Allen. In qualifying for the 2005 World Snooker Championship, he retired in the third round against Stuart Mann. In the English Amateur Championship 2007, he lost in the deciding frame of the final against Martin Gould by 7–8.[5]
Lilley tried to qualify for the main tour via the 2016 Q School. In the first tournament he reached the final of his group but then lost against Chen Zhe; in the second tournament he retired in the second round. Although he missed the qualification for the Main Tour, as 17th on the Q-School Order of Merit he could participate as a substitute for tournaments of the 2016–17 snooker season.
At the 2016 Indian Open, the second world ranking tournament of the season, he qualified for a ranking tournament for the first time. After defeating Tian Pengfei 4–3 in qualifying, he eliminated Mike Dunn, Mark Williams and Robert Milkins in the main round to reach the quarterfinals, where he lost to England's Shaun Murphy 2–4.[7]
He was first on the 2018 Q School Order of Merit. In the 18/19 season, he just missed out on gaining a tour card for the 19/20 season numerous times; he was 4th on the challenge tour list, and lost 5–4 to Kacper Filipiak in the 2019 EBSA European Snooker Championship, where a win would have granted him a place on the tour. He appeared in Snooker 19, making him the only player in the game who has never turned pro (the other amateurs in the game are former pros).[citation needed]
Lilley beat Sean Maddocks 4–0 in the final qualifying round of the first event of the 2019 Q School, finally becoming a professional after 30 years as an amateur.[2] While an amateur, he had worked in the insurance industry.[4] Lilley later remarked that his timing was bad, as no sooner had he joined the professional tour then the COVID-19 pandemic led to the mass cancellation of tournaments.[4]
After a successful 2023-2024 season - the best of his career in terms of ranking points - David finished the season ranked 64th, reaching the top 64 for the first time at the age of 48.[10]
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