Underdogs David Gilbert and Gary Wilson have risen to the occasion to give their established opponents plenty to think about during the World Championship semi-finals at the Crucible.Gilbert came close to a maximum break as he marked his debut in the venue’s one-table set-up in style by forging a 5-3 overnight lead against four-time champion John Higgins.And qualifier Wilson also gave title favourite Judd Trump all he could handle with a magnificent 140 total clearance capping an excellent evening session from which the pair finished level at 4-4.Higgins and Trump had started as the overwhelming favourites to set up a repeat of their 2011 final showdown against opponents who have spent the best part of a decade battling for their tour survival.In the same year Higgins beat Trump for the title, Gilbert was having to re-qualify for the tour through Q-School, while Wilson was scrapping for a second chance playing low-key club matches in his native north-east.Picking up from where he left off, Gilbert then extended his lead over the veteran Higgins to take a 10-6 lead after the second session.At one point, the underdog took six frames in a row to go 8-3 up, but Higgins managed to pull three games back whilst conceding a further two.As for Wilson and Trump, they are currently playing their semi-final and it's currently 9-7 in frames to the latter.However, it was Wilson who suffered a rather embarrassing moment earlier on in the day's play when he completely miscued and shanked the simplest of shots.

Looking to pot what seemed an easy red into the middle pocket, Wilson must've taken his eye of the cue and the ball as he shanked the white ball itself into the pocket.

A shot you'd expect to see at your local club after a few pints, not at the Crucible in the semi-final.

Just goes to show, though, even the very best are human after all.