World Championship Snooker Extra2013Day 1BBC Two Duration: 2 hoursFirst broadcast: Sun 21st Apr 2013, 01:05 on BBC Two HDLatest broadcast: Sun 21st Apr 2013, 01:05 on BBC Two EnglandHighlights of the opening day's play are introduced from the Crucible Theatre in Sheffield.ContributorsParticipant:Steve DavisParticipant:Ken DohertyParticipant:John ParrottParticipant:Stephen HendryParticipant:Terry GriffithsParticipant:Dennis TaylorParticipant:Willie ThorneParticipant:John VirgoExecutive Producer:Alison WitkoverExecutive Producer:Graham FryGenresSportSnookerBrandWorld Championship Snooker ExtraSeriesWorld Championship Snooker Extra: 2013 Source: BBC Online