Ronnie O’Sullivan experienced a surprising early exit at the Northern Ireland Open in Belfast, falling 4-3 to world No. 110 Cheung Ka Wai in the tournament’s opening round. The seven-time world champion, widely regarded as one of snooker’s all-time greats, was defeated by the Hong Kong qualifier, who secured three consecutive frames to complete his first main draw knockout victory at a ranking event.

This match marked O’Sullivan’s first competitive appearance in the UK since his 13-12 loss to John Higgins in the second round of the World Championship in Sheffield in April. Despite limited play this season, having entered only his third tournament, O’Sullivan displayed glimpses of his renowned scoring ability, compiling breaks of 56, 138, and 72 during the contest.

Early in the match, O’Sullivan showcased his skill with a total clearance of 138 in the second frame. However, errors in key moments allowed Cheung to capitalize. The qualifier, who began competing on the professional tour in 2024, appeared to be under pressure when O’Sullivan reached the table first in the fifth frame, but left a red ball precariously positioned. Cheung seized the opportunity with an 88 break to level the match.

The momentum swung further as Cheung exploited a missed brown by O’Sullivan, delivering a 77 break to draw level again. The deciding frame saw O’Sullivan miss a blue ball, leaving the door open for Cheung to compile a decisive 60-point break and clinch the win.

Cheung’s victory represents a significant milestone early in his professional career and highlights the unpredictability inherent in snooker, where even highly decorated competitors can be challenged by emerging talents. Meanwhile, O’Sullivan will likely reflect on the missed chances that contributed to a rare defeat on home soil.