13:00Snooker: World Championship2017Episode 97: Day 11, Quarter-Finals, Afternoon SessionBBC Two Duration: 5 hours Tue 25th Apr 2017, 13:00 on BBC Two Northern IrelandHazel Irvine introduces quarter-final action. The first two matches got under way on Tuesday morning. Matches are the best of 25 frames, played over three sessions.GenresSportSnookerBrandSnooker: World ChampionshipSeriesSnooker: World Championship: 2017 Source: BBC Online