The last four at the World Snooker Championship are all former world champions, including Scotland's John Higgins ©Getty Images

Four former world champions, including three members of the Class of 92, have filled the semi-final spots at the World Snooker Championship.

One of the Class of 92 members to book their last four places was Scotland’s John Higgins, who was taken the distance before edging past England’s Jack Lisowski 13-12.

Higgins started the first of the day’s two sessions at the Crucible Theatre in Sheffield with a 5-3 lead and made a break of 123 in the first of the day to open up a three-frame advantage.

Higgins led 8-5 later in the session, before Lisowski claimed frame 14 on the black, and frame 15 following a safety battle on the pink, to end the session 8-7 behind.

In the evening Higgins led 11-9 before Lisowski produced a storming spell of snooker to win three in a row to move 12-11 in front.

Higgins made a break of 105 to force a decider where Lisowski missed a tough red to the left corner allowing the Scot to claim a hard-fought victory with a break of 72.

Higgins will face England’s Ronnie O’Sullivan, another member of the Class of 92, in the last four.

World number one O’Sullivan, bidding for a record-equalling seventh world title, came into the day’s final session leading Scotland’s Stephen Maguire 11-5.

Breaks of 71 and 126 saw O’Sullivan wrap up a 13-5 win in just 19 minutes of play today.

The third member of the Class of 92 in the semi-final line-up is Mark Williams of Wales, with the four-time world champion overcoming China’s Yan Bingtao 13-11.

The final session of the match resumed at 8-8 with the pair sharing the first four frames, which included a break of 135 from 47-year-old Williams.

The next two frames were also shared before Williams struck the front with a break of 66 to move 12-11 in front.

After Yan missed a long red in the next, Williams made a break of 78 to seal his last four place.

The semi-final line-up is completed by Judd Trump, world champion in 2019, as he beat fellow Englishman Stuart Bingham 13-8.

Trump resumed the first of the day’s two sessions with a 5-3 lead, but Bingham won the first five frames of the morning, including a break of 89, to lead 8-5.

After Bingham missed a black off the spot in frame 14 the momentum changed with Trump finishing the session level at 8-8, and pulling away in the evening session and winning 13-8.

A top break of 78 for Trump plus a big miss on the pink in frame 19 from Bingham, completed the turnaround, with Trump facing Williams in the last four.

The semi-final matches are due to be played over three days from tomorrow until Saturday (April 30), with both contests taking place over a scheduled four sessions and the best of 33 frames.