Ronnie O'Sullivan and Mark Williams played out an instant classic at the Tour Championships, with the Rocket winning in a final-frame decider.
O'Sullivan and Williams have nine world titles between them, so a high quality quarter-final match-up was always expected.
The Llandudno crowd were treated to something even better than the expectation, though, with O'Sullivan hitting five centuries en-route to a 10-9 win.
Williams was in fine form too, and he refused to go away despite O'Sullivan's frantic scoring whilst among the balls.
O'Sullivan led 7-5 at the evening mid-session interval, but Williams dug-in to force a decider.
As nerves set in, it was O'Sullivan who managed to sink the final red and clear to pink to book his place in the semi-finals.
Asked what he said to Williams after the match, O'Sullivan told ITV: "I just said you never missed a long ball all day, it was just ridiculous, it was mental.
"Neil Robertson can pot long balls but he'd have to go some to pot as many as he did today."
O'Sullivan was not as complimentary to himself on his own long-potting, though, with him identifying it as his Achilles heel on the day.
"If I made a few long balls than maybe it would have been alright," he explained.
"But it's like trying to win a golf tournament when you can't hit a fairway. Having to chip out and putt, that's what I was doing today, just hanging on.
"My scoring was alright, I didn't think I was going to get a chance in the last, pleased to get a chance and make it a bit close.
"I couldn't pot a long ball all match and when you can't pot a long ball it's hard to get in against people who are so good, like Mark, they don't give you easy chances.
"Every chance I did get I scored, that was the only way I was going to win really. Try and keep it tight and tidy, if I get 10 chances, try and win it in one visit. I just couldn't pot long balls and it's hard.
"I couldn't pot one and he never missed one all day. Some ridiculous ones as well."