Neil Robertson v Mark Allen could be a cracker: a display of long potting and break-building from two of the most attacking players in the game.
Allen, though he's done well so far, is still waiting for his big breakthrough title win.
Robertson was once in this position but, since winning his first title in 2006, has not looked back.
The pace of tonight's match between Peter Ebdon and Marco Fu may be a little more sedate. They played a dramatic World Championship semi-final in 2006, which Ebdon finally won 17-16 having led 15-9.
Fu went a little negative after playing well to build a 5-1 lead over Stephen Maguire in the previous round and had to survive a tension filled last frame to win 6-4.
Ebbo is, of course, granite, as he proved in crawling past Ali Carter and don't be surprised if he prevails in another midnight finish.