It's no overstatement to say that Ken Doherty's match against Gerard Greene in then final qualifying round of the World Championship today is one of the biggest of his entire career.
The reason for this is that it could herald the end of his career if he loses.
Doherty's had a wretched season in which he has won just two matches.
If he doesn't beat Greene he will be out of the top 32 and consigned to spend even more time at the qualifiers next season, hardly a happy hunting ground for him during the current campaign.
It's therefore hardly surprising he has been putting the hours in here at the English Institute of Sport.
He arrived in Sheffield on Friday and has been practising hard every day since.
Ken's been not only a great player but also a great ambassador for the sport.
It would be sad to think there won't be at least one last great hurrah for him.