Ronnie O'Sullivan and Judd Trump are locked at 4-4 after the first session of their World Championship semi-final.

'The Rocket' from Essex took four of the first five frames, with Bristol's Trump only winning a tense second courtesy of a re-spotted black.

But Trump won the last three frames to leave the best-of-33 tie finely poised.

The match resumes at 11am on Friday.

Ronnie O'Sullivan (Eng) 4-4 Judd Trump (Eng)

87-2 (65), 68-75*, 80-28, 75-4 (75), 93-0 (89), 0-76 (50), 56-65 (O'Sullivan 56), 40-76 (72)

*won on re-spotted black