We wondered how Judd Trump would cope with having a bad session at the Betfred.com World Championship and he coped extremely well as a much better performance last night left his semi-final against Ding Junhui poised at 12-12.
These long matches are effectively a series of matches, played over four sessions. Trump got over his disappointing display in the morning by producing some stunning shot-making in the evening.
This has been an absorbing, at times enthralling contest between two young stars of the game. For once, it's almost as if the semi-finals aren't long enough. I could watch plenty more of this one.
John Higgins, as usual, dug deep into his deep reservoir of reserves to stay with Mark Williams, who at 9-5 yesterday looked set to take complete control of their semi-final.
Williams produced some excellent snooker and could have led 10-5 but Higgins made a trademark pressure clearance and then won the last to trail only 9-7.
Both semi-finals look set to be close today, which is good for the tournament but not neccessarily for the players, who still have a two-day final to come.
But that's the test provided by the World Championship: it's a battle to be the last man standing.
And today looks set to be the most dramatic of the Crucible marathon so far.