Ronnie O’Sullivan hit the highest ever break in professional snooker as he ended on a sensational 153 at the World Open.The seven-time world champion achieved the feat in the first frame of his quarter-final clash against Ryan Day.O’Sullivan made snooker history on Friday at the World OpenGettyAfter making the most of a free black ball, O’Sullivan went on to clear the table in Yushan, China in style.He managed to hit 153, which means he has surpassed the traditional highest break total of 147.O’Sullivan is the first player to go past a 147 since Jamie Burnett in 2004 when he hit 148 during qualifying of the UK Championship.The 50-year-old could have made an even more impressive piece of history as he was only two points off the highest possible total of 155.View Tweet: https://twitter.com/ronnieo147?ref_src=twsrc%5EtfwSpeaking on TNT Sports, former snooker world no. 3 Neal Foulds said: “A privilege to be here to watch that. To speak over it.“That was an incredible moment for me just to watch O’Sullivan do what he did there. “A break of 153, it’s almost like, ‘Did it really happen? Have I dreamt it?’ Incredible stuff.”Foulds added: “He’s just playing as fluently as ever. “He’s not overthinking any shot. Wow, this is just mind-blowing. A very, very special moment.”O’Sullivan has previously hit a maximum break of 147 on 17 occasions, but has now gone a step further with a legendary run.O’Sullivan achieved the legendary feat at the start of his 5-0 win over DayGettyIn a video on X, he said: “Just want to say a big shout out to all the people that have been messaging me, congratulating me on the 153.“It was a pretty cool moment, really happy to do it, so thank you to everyone who has supported me.“Keep enjoying the snooker in Yushan, take care.”What next for O’Sullivan at the World Open?O’Sullivan, who recently dropped out of the world top ten, is into his first World Open semi-final since 2010.He beat Ross Muir 5-1 in qualifying, despite having a small wardrobe malfunction that prompted him to walk out of the hall.A walkover against Ishpreet Singh Chadha sent him into the second round, where he won 5-0 against fellow Brit Matthew Selt.O’Sullivan has added the 153 break to an extensive list of accoladesGettyO’Sullivan then beat the 2005 world champion Shaun Murphy in the last 16 before making snooker history when facing Day.Up next in the semi-finals is Wu Yize, who is making his first ever final four appearance at the World Open.One of Judd Trump, Hossein Vafaei, Thepchaiya Un-Nooh and Gary Wilson will meet the winner in the final.