China's Si Jiahui booked his place in the quarterfinals at the World Snooker Championship for the second time in three years after beating Ben Woollaston 13-10 in Sheffield, England, on Monday.

The 13th seed held a 9-7 overnight lead heading into the third session, but Woollaston was able to win the 18th frame with a century break of 110 to level the match at 9-9.

The two then started to trade the lead. 2023 semi-finalist Si took the 19th frame with a break of 51, before the Englishman pulled one back with a 90-7 win to tie the score again at 10-10.

But 23-year-old Si took control after that. He first went on a run of 63 in the 21st frame to regain the lead at 11-10. And in the 22nd, Si's confidence was there for all to see when he had a century break of 126, which included some spectacular shots to go 12-10 ahead and one frame away from victory.

Si eventually took it 13-10 and followed compatriot Zhao Xintong into the last eight where he will face seven-time champion Ronnie O'Sullivan. Afterwards he revealed that nerves nearly got the better of him.

"We had a break when the match was tied up at 10-all, and I went to the practice table to keep my hands warm. I took a couple of shots there to ease myself a bit as I was a bit of nervous. This helped me to play better in the last three frames, and I eventually won the match in the end," said Si.

In other action, Chinese ace Ding Junhui was knocked out by Luca Brecel. Ding was behind 12-4 before the final session and never really mounted a serious comeback. Belgium's 2023 world champion won the contest 13-4 with a break of 71.

Meanwhile, O'Sullivan outplayed China's Pang Junxu 13-4, as he made two centuries and ten half-centuries with a break of 95 to complete a routine victory.