Six-times world champion Ronnie O’Sullivan says he thinks a gripping day ahead at the Crucible could see a final frame decider and also a dramatic delay to proceedings.

The Rocket said he did not think Mark Selby and Stuart Bingham will finish their match before the 7pm scheduled start time of the climax of other semi-final between Kyren Wilson and Shaun Murphy.

O’Sullivan made his views after Selby and Bingham finished a riveting third semi-final session on Friday night after 11.30pm.

Starting the session 9-7 behind, Bingham dominated proceedings at the Crucible to take an overnight lead of 13-11.

In a long session, two of the eight frames played were more than an hour long.

However, the 2015 world champion now stands just four frames away from reaching his second World Championship final.

The pair will conclude what has been a gripping semi-final so far on Saturday afternoon with play due to start at 2.30pm.

But O’Sullivan and Neal Foulds, both working as pundits for Eurosport, said the match could go “all the way” and into the evening – which could see the final session of the second semi-final being delayed.

O’Sullivan said: “I think it (Selby vs Bingham) is going all the way.

“We were talking before and saying it could push the next match in the evening a little bit back later. I think you are going to get more (tactical frames) of what we’ve had tonight.”

Foulds added: “From what we saw tonight, if Selby gets back into this match then they are never going to finish on time.”