Coverage of the opening frames in two second-round clashes at the Crucible in Sheffield. One of the best-of-25-frames matches could feature Mark Williams , champion in 2000 and 2003, so long as the 30-year-old safely negotiated his first-round match against Robert Milkins. 6)BBCi: digital viewers can access additional live coverage of both tables, plus a news and statistics service, via the red button There's radio coverage in Sport on 5 from 11.55am on BBC Radio 5 Live