Summarize this content to 2000 words in 6 paragraphs The shocks continued at the World Championship, as three-time winner Mark Williams crashed out at the hands of Si Jiahui.Si was a semi-finalist 12 months ago and had to qualify, while Williams arrived at the Crucible on the back of victory at the Tour Championship.Williams held a 5-4 lead after the first session, but Si ran through the first four frames on Tuesday afternoon and held firm to win a decider to reach round two.Defeat saw Williams join seeds Luca Brecel, Mark Selby, Gary Wilson, Ali Carter and Zhang Anda in falling at the first hurdle.Both players had chances in the opening frame of the session.Williams had the opportunity to snatch it after a missed black from his opponent, but he failed to pot a tough final red to the green pocket.Si knocked in a couple of pressure balls, notably a superb brown from mid range into the green pocket, and it allowed him to take the frame and level the scores at 5-5.The 11th followed a similar pattern to the previous frame, as Si worked a large lead but handed a chance to Williams when going in-off after potting a red.‘Unbelievable’ – Si pots red but sees white go in-offAs in the 10th, Williams looked set to snatch it only to miss the final red – this time looking on in shock as it seemed to turn to the left and fail to drop into the right middle. Si stepped from his chair to pick off the points required to move back in front.The Crucible holds no terrors for Si, as he showed with his run to the semi-finals last year, and he opened up a two-frame advantage for the first time in the match thanks to a run of 61 in the 12th. Williams looked rattled by the onslaught of his opponent, and punched his cue in frustration when seeing a counter stopped in its tracks by a missed red into the left middle.Williams punches his cue after missed redThe Welshman took to sitting on the steps near the exit as he waited for Si to pot the balls to wrap up the final frame before the interval to take an 8-5 lead.The interval came at a good time for Williams, as it handed him 15 minutes to regroup. He returned and knocked in an excellent long red to suggest the potting arm was still solid. Williams did not close out the frame in one visit, but he found a superb long red to the green pocket and it enabled him to get on the scoreboard in the session.’What a shot’ – Williams pots superb long redThe 15th was a scrappy affair, with reds clustered together and colours tied up – and the drawn-out frame resulted in Si asking referee Leo Scullion for a mid-frame comfort break. “If you’ve got to go, you’ve got to go’ – Si asks for mid-frame comfort breakSi was behind at the point he left the table and he was unable to force his way back into it as Williams cut the deficit to one frame.The 16th saw Si make a series of excellent pots as he took the frame to leave him two up with three to play.Si showed no signs of nerves as he got going in the 17th frame with an excellent red to the bottom left. But he missed a pink to the left middle when on a break of 39 to hand Williams a chance to counter.As in earlier frames, Williams missed the final red – but he got another bite at the cherry and crunched in a brilliant red to the green pocket. He picked off the colours to keep his hopes alive.A safety error from Si – catching the knuckle of the right middle when attempting to reach baulk – allowed Williams to take the 18th and force a deciding frame.Williams missed a tough red to the right middle and a double kiss handed Si the first chance in the decider.Si beat Shaun Murphy in a decider last year, and he had that knowledge to draw on as he compiled a brilliant break of 77 – his highest of the match – to knock out the 2000, 2003 and 2018 champion.Stream top snooker action, including the World Snooker Championship, live on Eurosport and discovery+
