Chinese youngster Si Jiahui snatched a 5-3 lead in an intriguing first session of his World Championship semi-final showdown with Luca Brecel.
The 20-year-old, who came through qualifying at the Crucible to make the latter stages, lost the first frame, but produced back-to-back clearances of 125, 102 and 97 to punish Brecel for errors with a near-faultless display of break building.
